diff --git a/assets/js/podcast-player.js b/assets/js/podcast-player.js
index a17efd0..926ff87 100644
--- a/assets/js/podcast-player.js
+++ b/assets/js/podcast-player.js
@@ -33,8 +33,8 @@
  */
 export function detectSourceType(url) {
   if (!url) return "local";
-  if (/ivoox\.com/i.test(url)) return "ivoox";
-  if (/azuracast/i.test(url) || /\.stream\./i.test(url)) return "azuracast";
+  if (/^(https?:)?\/\/[^\/]*ivoox\.com/i.test(url)) return "ivoox";
+  if (/azuracast\./i.test(url) || /\.stream\./i.test(url)) return "azuracast";
   return "local";
 }
 
@@ -71,6 +71,9 @@ export class AzuracastAdapter {
     if (src) return src;
     const apiUrl = this.element.getAttribute("azuracast-api-url");
     if (!apiUrl) throw new Error("AzuracastAdapter: missing azuracast-api-url attribute");
+    // Validate scheme before fetching to prevent client-side SSRF
+    const parsed = new URL(apiUrl);
+    if (parsed.protocol !== "https:") throw new Error("AzuracastAdapter: azuracast-api-url must use HTTPS");
     const resp = await fetch(apiUrl);
     if (!resp.ok) throw new Error(`AzuracastAdapter: API error ${resp.status}`);
     const data = await resp.json();
@@ -95,6 +98,14 @@ export class IvooxAdapter {
   async resolve() {
     const src = this.element.getAttribute("src");
     if (!/ivoox\.com/i.test(src)) return src;
+    // Validate scheme and domain to prevent client-side SSRF
+    try {
+      const parsed = new URL(src);
+      if (parsed.protocol !== "https:" || !parsed.hostname.endsWith("ivoox.com")) {
+        console.warn("IvooxAdapter: refusing to fetch non-ivoox.com or non-HTTPS URL", src);
+        return src;
+      }
+    } catch { return src; }
     try {
       const resp = await fetch(src);
       if (!resp.ok) return src;
@@ -113,6 +124,24 @@ export class IvooxAdapter {
 }
 
 /* ---- Open-source SVG icons (Feather/Lucide, MIT licensed) ---- */
+
+/**
+ * Compare two URLs by pathname + search, ignoring protocol/domain differences.
+ * Falls back to suffix matching for non-URL strings.
+ * @param {string} a
+ * @param {string} b
+ * @returns {boolean}
+ */
+function urlsMatch(a, b) {
+  try {
+    const uA = new URL(a, document.baseURI);
+    const uB = new URL(b, document.baseURI);
+    if (uA.pathname === uB.pathname && uA.search === uB.search) return true;
+    // Also match if paths differ only by trailing slash
+    return uA.pathname.replace(/\/$/, "") === uB.pathname.replace(/\/$/, "")
+      && uA.search === uB.search;
+  } catch { return a.endsWith(b) || b.endsWith(a); }
+}
 const ICON_SKIP_BACK =
   '<svg viewBox="0 0 24 24" width="16" height="16" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="1 4 1 10 7 10"/><path d="M3.51 15a9 9 0 1 0 2.13-9.36L1 10"/></svg>';
 const ICON_SKIP_FWD =
@@ -1007,7 +1036,7 @@ class PodcastPlayer extends HTMLElement {
     const src = e.detail && e.detail.src;
     const mySrc = this._audio.src || this.getAttribute("src") || "";
     // Only react if the event matches our source (or if unknown — backward compat)
-    if (src && src !== mySrc && !src.endsWith(mySrc) && !mySrc.endsWith(src)) return;
+    if (src && src !== mySrc && !urlsMatch(src, mySrc) && !urlsMatch(mySrc, src)) return;
 
     if (this._audio.src && !this._audio.paused) {
       this._audio.pause();
@@ -1042,7 +1071,7 @@ class PodcastPlayer extends HTMLElement {
     const mySrc = this._audio.src || this.getAttribute("src") || "";
     if (!mySrc || !src) return;
 
-    if (mySrc === src || src.endsWith(mySrc) || mySrc.endsWith(src)) {
+    if (mySrc === src || urlsMatch(src, mySrc) || urlsMatch(mySrc, src)) {
       // Same source: someone else started our track — sync button to show pause
       this._els.playBtn.innerHTML = '<svg viewBox="0 0 512 512" width="24" height="24"><path fill="currentColor" d="M144 96h96v320h-96zM272 96h96v320h-96z"/></svg>';
       this._els.playBtn.setAttribute("aria-label", this._t("player_pause"));
@@ -1062,7 +1091,7 @@ class PodcastPlayer extends HTMLElement {
     // Only seek if the event's source matches ours — prevents a paused
     // player's progress bar interaction from affecting the active player.
     const mySrc = this._audio.src || this.getAttribute("src") || "";
-    if (src && mySrc && src !== mySrc && !src.endsWith(mySrc) && !mySrc.endsWith(src)) return;
+    if (src && mySrc && src !== mySrc && !urlsMatch(src, mySrc) && !urlsMatch(mySrc, src)) return;
     if (!this._audio.duration) return;
     // Silently seek without dispatching our own seek event
     this._audio.currentTime = Math.min(time, this._audio.duration);
@@ -1218,6 +1247,11 @@ class PodcastPlayer extends HTMLElement {
       if (currentSrc && state.src && !this._urlsMatch(state.src, currentSrc)) {
         return;
       }
+      // Validate restored src scheme to prevent sessionStorage manipulation
+      try {
+        const u = new URL(state.src, document.baseURI);
+        if (u.protocol !== "http:" && u.protocol !== "https:") return;
+      } catch (_) { return; }
 
       // Defer position + autoplay to loadedmetadata (where duration is known)
       this._pendingRestoreState = state;
@@ -1363,7 +1397,7 @@ class PodcastPlayer extends HTMLElement {
     const d = e.detail || {};
     // Only react if src matches
     const mySrc = this._audio.src || this.getAttribute("src") || "";
-    if (d.src && mySrc && d.src !== mySrc && !d.src.endsWith(mySrc) && !mySrc.endsWith(d.src)) return;
+    if (d.src && mySrc && d.src !== mySrc && !urlsMatch(d.src, mySrc) && !urlsMatch(mySrc, d.src)) return;
 
     // Guard against echo — suppress our own dispatch while updating UI
     this._suppressSync = true;
@@ -1786,7 +1820,7 @@ class PodcastFooter extends HTMLElement {
     const mySrc = this._audio.src || "";
     // Ignore pauses from a different source (avoids incorrectly stopping when
     // one player replaces another)
-    if (src && mySrc && src !== mySrc && !src.endsWith(mySrc) && !mySrc.endsWith(src)) return;
+    if (src && mySrc && src !== mySrc && !urlsMatch(src, mySrc) && !urlsMatch(mySrc, src)) return;
 
     if (this._audio.src && !this._audio.paused) {
       this._audio.pause();
@@ -1830,7 +1864,7 @@ class PodcastFooter extends HTMLElement {
     if (time == null || !isFinite(time)) return;
     // Only seek if the source matches what the footer is playing
     const mySrc = this._audio.src || "";
-    if (src && mySrc && src !== mySrc && !src.endsWith(mySrc) && !mySrc.endsWith(src)) return;
+    if (src && mySrc && src !== mySrc && !urlsMatch(src, mySrc) && !urlsMatch(mySrc, src)) return;
     if (!this._audio.duration) return;
     this._audio.currentTime = Math.min(time, this._audio.duration);
   }
@@ -1919,7 +1953,7 @@ class PodcastFooter extends HTMLElement {
     const d = e.detail || {};
     // Only react if src matches
     const mySrc = this._audio.src || "";
-    if (d.src && mySrc && d.src !== mySrc && !d.src.endsWith(mySrc) && !mySrc.endsWith(d.src)) return;
+    if (d.src && mySrc && d.src !== mySrc && !urlsMatch(d.src, mySrc) && !urlsMatch(mySrc, d.src)) return;
 
     this._suppressSync = true;
     try {
@@ -2028,6 +2062,15 @@ class PodcastFooter extends HTMLElement {
 
       if (!state.src) return;
 
+      // Validate restored src scheme to prevent sessionStorage manipulation
+      try {
+        const u = new URL(state.src, document.baseURI);
+        if (u.protocol !== "http:" && u.protocol !== "https:") {
+          console.warn("PodcastFooter: ignoring restored src with unsafe scheme", u.protocol);
+          return;
+        }
+      } catch (_) { return; }
+
       // Restore volume/mute/rate immediately
       if (state.volume != null)        this._audio.volume = state.volume;
       if (state.muted != null)         this._audio.muted = state.muted;
diff --git a/exampleSite/hugo.toml b/exampleSite/hugo.toml
index 87099e9..acc810f 100644
--- a/exampleSite/hugo.toml
+++ b/exampleSite/hugo.toml
@@ -71,6 +71,9 @@ defaultContentLanguageInSubdir = false
         persistent = true
         preload = "metadata"
 
+# WARNING: unsafe=true allows raw HTML in Markdown content (including <script> tags).
+# Only enable this if all content authors are trusted. For sites with untrusted
+# contributors, set unsafe=false and use shortcodes for HTML needs.
 # Allow raw HTML in Markdown
 [markup]
   [markup.goldmark]
diff --git a/exampleSite/layouts/_default/baseof.html b/exampleSite/layouts/_default/baseof.html
index 20c8b98..46e22c2 100644
--- a/exampleSite/layouts/_default/baseof.html
+++ b/exampleSite/layouts/_default/baseof.html
@@ -5,6 +5,10 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>{{ block "title" . }}{{ .Site.Title }}{{ end }}</title>
   <meta name="description" content="{{ site.Params.description }}">
+  {{- /* Content Security Policy */ -}}
+  {{- $raw := printf "%d%s" now.Unix .Site.Title | sha256 -}}
+  {{- $cspNonce := substr $raw 0 20 -}}
+<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' 'nonce-{{ $cspNonce }}'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; media-src 'self' https:; connect-src 'self' https:; frame-ancestors 'none';">
   {{- if .IsTranslated }}
     {{- range .Translations }}
     <link rel="alternate" hreflang="{{ .Language.Lang }}" href="{{ .Permalink }}">
@@ -22,9 +26,9 @@
   <link rel="manifest" href="{{ "site.webmanifest" | relURL }}">
   {{ $turbolinks := resources.Get "js/vendor/turbolinks.js" | fingerprint }}
   <script src="{{ $turbolinks.RelPermalink }}" integrity="{{ $turbolinks.Data.Integrity }}"></script>
-  {{- $codeCopy := resources.Get "js/code-copy.js" -}}
+  {{- $codeCopy := resources.Get "js/code-copy.js" | fingerprint -}}
   {{- if $codeCopy }}
-  <script src="{{ $codeCopy.RelPermalink }}" defer></script>
+  <script src="{{ $codeCopy.RelPermalink }}" integrity="{{ $codeCopy.Data.Integrity }}" defer></script>
   {{- end }}
   {{- /* Always load podcast-player CSS so the persistent footer has theme support on every page */ -}}
   {{- $playerCSS := resources.Get "css/podcast-player.css" -}}
@@ -101,7 +105,7 @@
 
   <podcast-footer id="podcast-footer" data-turbolinks-permanent data-turbo-permanent hx-preserve></podcast-footer>
 
-  <script>
+  <script nonce="{{ $cspNonce }}">
     (function() {
       'use strict';
       var STORAGE_KEY = 'podcast-demo-theme';
@@ -179,7 +183,7 @@
     "player_error" "player_no_source" "player_unknown_episode"
     "code_copy_title" "code_copy_label" "code_copied" "code_copied_label"
   -}}
-  <script>
+  <script nonce="{{ $cspNonce }}">
   window.wavecast = window.wavecast || {};
   window.wavecast.i18n = {
     {{- range $i18nKeys }}
@@ -189,12 +193,12 @@
   </script>
   {{- /* Browser language auto-detection — redirect to preferred language on first visit */}}
   {{- if hugo.IsMultilingual }}
-  <script>
+  <script nonce="{{ $cspNonce }}">
   (function() {
     var KEY = 'lang-pref';
     try {
-      if (sessionStorage.getItem(KEY)) return;
-      sessionStorage.setItem(KEY, '1');
+      if (localStorage.getItem(KEY)) return;
+      localStorage.setItem(KEY, '1');
     } catch(e) { return; }
 
     var current = '{{ .Site.Language.Lang }}';
diff --git a/exampleSite/layouts/_default/schedule.html b/exampleSite/layouts/_default/schedule.html
index bcc2eb3..905490c 100644
--- a/exampleSite/layouts/_default/schedule.html
+++ b/exampleSite/layouts/_default/schedule.html
@@ -32,6 +32,10 @@ <h3 style="font-size:1rem">{{ .name }}</h3>
           {{- $found = true }}
           <span class="badge" style="background:var(--pp-surface);color:var(--pp-text-muted);text-transform:none;font-size:0.7rem;margin-bottom:0.25rem">{{ .time }}</span>
           {{- $u := .url }}
+          {{- /* Validate URL scheme — reject dangerous protocols */ -}}
+          {{- if and $u (not (or (hasPrefix $u "http://") (hasPrefix $u "https://") (hasPrefix $u "/") (hasPrefix $u "#") (hasPrefix $u "."))) -}}
+            {{- errorf "schedule: URL must be HTTP(S), relative, fragment, or dot-relative path, got %q" $u -}}
+          {{- end -}}
           {{- if not (hasPrefix $u "http") }}
             {{- $u = printf "%s%s" (strings.TrimSuffix "/" $.Site.BaseURL) $u }}
           {{- end }}
@@ -56,6 +60,10 @@ <h3>{{ .title }} <span style="font-weight:400;color:var(--text-muted);font-size:
       <p class="episode-meta">{{ .day }} &middot; {{ .time }}</p>
       <p>{{ .description }}</p>
       {{- $eu := .url }}
+      {{- /* Validate URL scheme — reject dangerous protocols */ -}}
+      {{- if and $eu (not (or (hasPrefix $eu "http://") (hasPrefix $eu "https://") (hasPrefix $eu "/") (hasPrefix $eu "#") (hasPrefix $eu "."))) -}}
+        {{- errorf "schedule: URL must be HTTP(S), relative, fragment, or dot-relative path, got %q" $eu -}}
+      {{- end -}}
       {{- if not (hasPrefix $eu "http") }}
         {{- $eu = printf "%s%s" (strings.TrimSuffix "/" $.Site.BaseURL) $eu }}
       {{- end }}
diff --git a/exampleSite/layouts/episodes/single.html b/exampleSite/layouts/episodes/single.html
index f811ead..d1c25f1 100644
--- a/exampleSite/layouts/episodes/single.html
+++ b/exampleSite/layouts/episodes/single.html
@@ -3,13 +3,13 @@
   {{- /* Load assets on first episode render per page */ -}}
   {{- if not (.Page.Store.Get "podcastPlayerAssetsLoaded") -}}
     {{- .Page.Store.Set "podcastPlayerAssetsLoaded" true }}
-    {{- $js := resources.Get "js/podcast-player.js" -}}
+    {{- $js := resources.Get "js/podcast-player.js" | fingerprint -}}
     {{- if $js }}
-    <script src="{{ $js.RelPermalink }}" type="module" defer></script>
+    <script src="{{ $js.RelPermalink }}" integrity="{{ $js.Data.Integrity }}" type="module" defer></script>
     {{- end }}
-    {{- $css := resources.Get "css/podcast-player.css" -}}
+    {{- $css := resources.Get "css/podcast-player.css" | fingerprint -}}
     {{- if $css }}
-    <link rel="stylesheet" href="{{ $css.RelPermalink }}">
+    <link rel="stylesheet" href="{{ $css.RelPermalink }}" integrity="{{ $css.Data.Integrity }}">
     {{- end }}
   {{- end }}
 
diff --git a/exampleSite/layouts/index.html b/exampleSite/layouts/index.html
index d18efba..29d2f83 100644
--- a/exampleSite/layouts/index.html
+++ b/exampleSite/layouts/index.html
@@ -3,13 +3,13 @@
   {{- /* Load podcast-player assets manually since the home page uses no shortcode */ -}}
   {{- if not (.Page.Store.Get "podcastPlayerAssetsLoaded") -}}
     {{- .Page.Store.Set "podcastPlayerAssetsLoaded" true }}
-    {{- $js := resources.Get "js/podcast-player.js" -}}
+    {{- $js := resources.Get "js/podcast-player.js" | fingerprint -}}
     {{- if $js }}
-    <script src="{{ $js.RelPermalink }}" type="module" defer></script>
+    <script src="{{ $js.RelPermalink }}" integrity="{{ $js.Data.Integrity }}" type="module" defer></script>
     {{- end }}
-    {{- $css := resources.Get "css/podcast-player.css" -}}
+    {{- $css := resources.Get "css/podcast-player.css" | fingerprint -}}
     {{- if $css }}
-    <link rel="stylesheet" href="{{ $css.RelPermalink }}">
+    <link rel="stylesheet" href="{{ $css.RelPermalink }}" integrity="{{ $css.Data.Integrity }}">
     {{- end }}
   {{- end }}
 
diff --git a/exampleSite/layouts/partials/hero.html b/exampleSite/layouts/partials/hero.html
index 1a2a92c..6a3592b 100644
--- a/exampleSite/layouts/partials/hero.html
+++ b/exampleSite/layouts/partials/hero.html
@@ -10,6 +10,11 @@ <h1>{{ .title }}</h1>
   {{- with .buttons }}
   <div class="nav-buttons">
     {{- range . }}
+    {{- /* Validate URL scheme — reject dangerous protocols */ -}}
+    {{- if and .url (not (or (hasPrefix .url "http://") (hasPrefix .url "https://") (hasPrefix .url "/") (hasPrefix .url "#") (hasPrefix .url "."))) -}}
+      {{- errorf "hero button: URL must be HTTP(S), relative, fragment, or dot-relative path, got %q" .url -}}
+    {{- end -}}
+    {{- /* WARNING: .text is rendered as safeHTML to allow SVG icons. Only use trusted SVG markup from theme authors. */ -}}
     <a href="{{ .url }}" class="nav-button {{ .class }}">{{ .text | safeHTML }}</a>
     {{- end }}
   </div>
diff --git a/exampleSite/layouts/partials/program-card.html b/exampleSite/layouts/partials/program-card.html
index 5034279..d7baf79 100644
--- a/exampleSite/layouts/partials/program-card.html
+++ b/exampleSite/layouts/partials/program-card.html
@@ -1,5 +1,8 @@
 {{- /* program-card.html - renders a single program card with icon, title, description, episodes */ -}}
 {{- $icon := .icon -}}
+{{- if not (findRE "<svg\\b" $icon) }}
+  {{- errorf "program card: icon must be a valid SVG element, got: %.20s" $icon }}
+{{- end -}}
 {{- $url  := .url -}}
 {{- $title := .title -}}
 {{- $desc := .description -}}
diff --git a/layouts/_default/rss.xml b/layouts/_default/rss.xml
index d9e04cb..84f64cd 100644
--- a/layouts/_default/rss.xml
+++ b/layouts/_default/rss.xml
@@ -49,22 +49,22 @@
     {{- with $podcast.description }}<description>{{ . }}</description>{{ else }}<description>{{ .Site.Params.description | default .Site.Title }}</description>{{ end }}
     <language>{{ $podcast.language | default .Site.LanguageCode }}</language>
     {{- with $podcast.copyright }}<copyright>{{ . }}</copyright>{{ end }}
-    {{- with $podcast.author }}<itunes:author>{{ . }}</itunes:author>{{ end }}
+    {{- with $podcast.author }}<itunes:author>{{ . | transform.XMLEscape }}</itunes:author>{{ end }}
     {{- with $podcast.summary }}<itunes:summary>{{ . | transform.XMLEscape | safeHTML }}</itunes:summary>{{ end }}
-    {{- with $podcast.subtitle }}<itunes:subtitle>{{ . }}</itunes:subtitle>{{ end }}
-    {{- with $podcast.image }}<itunes:image href="{{ . | absURL }}" />{{ end }}
+    {{- with $podcast.subtitle }}<itunes:subtitle>{{ . | transform.XMLEscape }}</itunes:subtitle>{{ end }}
+    {{- with $podcast.image }}<itunes:image href="{{ . | absURL | transform.XMLEscape }}" />{{ end }}
     {{- range $podcast.categories }}
-    <itunes:category text="{{ .category }}">
-      {{- with .subcategory }}<itunes:category text="{{ . }}" />{{ end }}
+    <itunes:category text="{{ .category | transform.XMLEscape }}">
+      {{- with .subcategory }}<itunes:category text="{{ . | transform.XMLEscape }}" />{{ end }}
     </itunes:category>
     {{- end }}
     <itunes:explicit>{{ $podcast.explicit | default "false" }}</itunes:explicit>
-    {{- with $podcast.owner_name }}<itunes:owner><itunes:name>{{ . }}</itunes:name>{{ with $podcast.owner_email }}<itunes:email>{{ . }}</itunes:email>{{ end }}</itunes:owner>{{ end }}
+    {{- with $podcast.owner_name }}<itunes:owner><itunes:name>{{ . | transform.XMLEscape }}</itunes:name>{{ with $podcast.owner_email }}<itunes:email>{{ . | transform.XMLEscape }}</itunes:email>{{ end }}</itunes:owner>{{ end }}
     <itunes:type>{{ $podcast.type | default "episodic" }}</itunes:type>
     {{- with $podcast.block }}<itunes:block>{{ . }}</itunes:block>{{ end }}
     <generator>Hugo — wavecast theme</generator>
     {{ with .OutputFormats.Get "rss" }}
-      {{ printf "<atom:link href=%q rel=\"self\" type=%q />" .Permalink .MediaType | safeHTML }}
+      {{ printf `<atom:link href="%s" rel="self" type="%s" />` (.Permalink | transform.XMLEscape) (.MediaType | transform.XMLEscape) | safeHTML }}
     {{ end }}
     {{- if not (eq (len $pages) 0) }}
     <lastBuildDate>{{ (index ($pages | first 1) 0).Lastmod.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</lastBuildDate>
@@ -93,7 +93,7 @@
             {{- $enclosureLen = len $res.Content }}
           {{- end }}
         {{- end }}
-        <enclosure url="{{ $enclosureURL }}" length="{{ $enclosureLen }}" type="{{ $enclosureType }}" />
+        <enclosure url="{{ $enclosureURL | transform.XMLEscape }}" length="{{ $enclosureLen }}" type="{{ $enclosureType | transform.XMLEscape }}" />
         {{- with $pPod.duration }}<itunes:duration>{{ . }}</itunes:duration>{{ end }}
         {{- with $pPod.author }}<itunes:author>{{ . }}</itunes:author>{{ else }}{{ with $podcast.author }}<itunes:author>{{ . }}</itunes:author>{{ end }}{{ end }}
         {{- with $pPod.subtitle }}<itunes:subtitle>{{ . | transform.XMLEscape | safeHTML }}</itunes:subtitle>{{ end }}
diff --git a/layouts/_shortcodes/button.html b/layouts/_shortcodes/button.html
index b81cea6..d4cecfe 100644
--- a/layouts/_shortcodes/button.html
+++ b/layouts/_shortcodes/button.html
@@ -3,6 +3,10 @@
   variants: primary | secondary | outline
 */ -}}
 {{- $url := .Get "url" -}}
+{{- /* Validate URL scheme — reject dangerous protocols */ -}}
+{{- if and $url (not (or (hasPrefix $url "http://") (hasPrefix $url "https://") (hasPrefix $url "/") (hasPrefix $url "#") (hasPrefix $url "."))) -}}
+  {{- errorf "shortcode: URL must be HTTP(S), relative, fragment, or dot-relative path, got %q" $url -}}
+{{- end -}}
 {{- $variant := .Get "variant" | default "primary" -}}
 {{- $icon := .Get "icon" -}}
 {{- $isExternal := or (hasPrefix $url "http://") (hasPrefix $url "https://") -}}
diff --git a/layouts/_shortcodes/figure.html b/layouts/_shortcodes/figure.html
index d848c9f..39c142c 100644
--- a/layouts/_shortcodes/figure.html
+++ b/layouts/_shortcodes/figure.html
@@ -8,6 +8,10 @@
 {{- $width := .Get "width" -}}
 {{- $href := .Get "href" -}}
 {{- $class := .Get "class" | default "" -}}
+{{- /* Validate URL scheme — reject dangerous protocols */ -}}
+{{- if and $href (not (or (hasPrefix $href "http://") (hasPrefix $href "https://") (hasPrefix $href "/") (hasPrefix $href "#") (hasPrefix $href "."))) -}}
+  {{- errorf "shortcode: URL must be HTTP(S), relative, fragment, or dot-relative path, got %q" $href -}}
+{{- end -}}
 
 {{- $isExternal := or (hasPrefix $href "http://") (hasPrefix $href "https://") (hasPrefix $href "//") -}}
 <figure class="wvc-figure{{ with $class }} {{ . }}{{ end }}">
diff --git a/layouts/_shortcodes/podcast-player.html b/layouts/_shortcodes/podcast-player.html
index 6ef0729..24c08df 100644
--- a/layouts/_shortcodes/podcast-player.html
+++ b/layouts/_shortcodes/podcast-player.html
@@ -38,6 +38,13 @@
 {{- if not $src -}}
   {{- errorf "podcast-player: required 'src' parameter is missing. See %s" .Position -}}
 {{- end -}}
+{{- /* Validate audio URL scheme */ -}}
+{{- if $src }}
+  {{- $scheme := urls.Parse $src }}
+  {{- if and $scheme.Scheme (not (or (eq $scheme.Scheme "http") (eq $scheme.Scheme "https"))) }}
+    {{- errorf "podcast-player: audio src must use http or https scheme, got %q" $scheme.Scheme }}
+  {{- end }}
+{{- end -}}
 
 {{- /* ---- 2. Site config defaults ---- */ -}}
 {{- $siteCfg := site.Params.podcastPlayer | default dict -}}
@@ -80,9 +87,9 @@
   {{- .Page.Store.Set "podcastPlayerAssetsLoaded" true -}}
 
   {{- /* JS — link directly if asset exists, else inline fallback */ -}}
-  {{- $js := resources.Get "js/podcast-player.js" -}}
+  {{- $js := resources.Get "js/podcast-player.js" | fingerprint -}}
   {{- if $js -}}
-    <script src="{{ $js.RelPermalink }}" type="module" defer></script>
+    <script src="{{ $js.RelPermalink }}" integrity="{{ $js.Data.Integrity }}" type="module" defer></script>
   {{- else -}}
     <script type="module">
       console.warn("podcast-player: JS asset not found — check your Hugo module setup.");
@@ -90,9 +97,9 @@
   {{- end -}}
 
   {{- /* CSS — link directly if asset exists */ -}}
-  {{- $css := resources.Get "css/podcast-player.css" -}}
+  {{- $css := resources.Get "css/podcast-player.css" | fingerprint -}}
   {{- if $css -}}
-    <link rel="stylesheet" href="{{ $css.RelPermalink }}">
+    <link rel="stylesheet" href="{{ $css.RelPermalink }}" integrity="{{ $css.Data.Integrity }}">
   {{- end -}}
 {{- end -}}
 
diff --git a/layouts/_shortcodes/video.html b/layouts/_shortcodes/video.html
index b13af6d..1e5cd21 100644
--- a/layouts/_shortcodes/video.html
+++ b/layouts/_shortcodes/video.html
@@ -4,6 +4,13 @@
   Autoplay always implies muted (browser requirement).
 */ -}}
 {{- $src := .Get "src" -}}
+{{- /* Validate video src URL scheme */ -}}
+{{- if $src }}
+  {{- $scheme := urls.Parse $src }}
+  {{- if and $scheme.Scheme (not (or (eq $scheme.Scheme "http") (eq $scheme.Scheme "https"))) }}
+    {{- errorf "video: src must use http or https scheme, got %q" $scheme.Scheme }}
+  {{- end }}
+{{- end -}}
 {{- $poster := .Get "poster" -}}
 {{- $caption := .Get "caption" -}}
 {{- $width := .Get "width" -}}