diff --git a/SECURITY.md b/SECURITY.md
index 0170bbe90..71e4ce922 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -72,7 +72,7 @@ The data proxies under `server/providers/` are written so the browser cannot tur
 - **Coalesced OAuth refresh** and cached successful responses only (OpenSky).
 - **Redacted debug logging.** The voice debug log (`.gev-logs/`, gitignored) strips API keys, bearer tokens, client secrets, and image data URLs before writing.
 - **Cross-site gate on cost/log endpoints.** The cost-bearing (`/api/realtime/token`, `/api/openai/hud-summary`, `/api/google/nearby-places`, `/api/google/text-search`) and log (`/api/realtime/debug-log`) endpoints refuse cross-site browser requests: a foreign or opaque `Origin`, a `Sec-Fetch-Site` other than `same-origin`/`none` (this is what blocks an `<img>`/navigation that carries no `Origin`), or any reverse-proxy/CDN forwarding header returns `403`. Non-browser loopback tools (the repo QA harnesses POST the token endpoint with no `Origin`) and the explicit `HOST=0.0.0.0` LAN opt-in keep working — the gate deliberately does not require a loopback remote address; that stricter requirement belongs only to the credential panel (`admitKeySetupRequest`). The Host check (`allowedHosts`, applied by `hostCheckPlugin` ahead of every route, since Vite's own check runs only after plugin middleware) rejects a rebinding `Host` before any handler runs, in every mode, and the gate is defense in depth behind it: the LAN opt-in keeps that check and accepts only IP addresses, `localhost` and names listed in `GEV_ALLOWED_HOSTS`. **Limit:** a name you list there is trusted like the app's own address, so list only names you control.
-- **Full Content-Security-Policy.** The dev and preview servers send a real CSP (`script-src 'self' 'unsafe-eval' blob:`: no inline script and no script from any other origin; `blob:` covers the object URLs Cesium's bundled workers bootstrap through in the built app), alongside the existing `X-Frame-Options: DENY` and `frame-ancestors 'none'`. `'unsafe-eval'` stays because Knockout, bundled inside Cesium's widgets package, resolves the global object with `eval` at load time and the globe does not initialize without it; styles permit `'unsafe-inline'` and Google Fonts because Vite's dev client injects `<style>` elements.
+- **Full Content-Security-Policy.** The dev and preview servers send a real CSP (`script-src 'self' 'unsafe-eval' blob:` plus the YouTube, Facebook and X scripts the Nepal event's embedded media loads, with a matching `frame-src` for their players and posts: no inline script and no other script origin; `blob:` covers the object URLs Cesium's bundled workers bootstrap through in the built app), alongside the existing `X-Frame-Options: DENY` and `frame-ancestors 'none'`. `'unsafe-eval'` stays because Knockout, bundled inside Cesium's widgets package, resolves the global object with `eval` at load time and the globe does not initialize without it; styles permit `'unsafe-inline'` and Google Fonts because Vite's dev client injects `<style>` elements.
 
 ## Network exposure — the operator threat model
 
diff --git a/build/vite.js b/build/vite.js
index 8680e80c1..036311cc1 100644
--- a/build/vite.js
+++ b/build/vite.js
@@ -6,7 +6,9 @@ import { panelBuildPlugin } from './panel.js';
 
 /**
  * Content-Security-Policy for every document the dev/preview server serves.
- * No inline script and no foreign script origin is permitted. 'unsafe-eval' is
+ * No inline script is permitted, and the only foreign script origins are the
+ * three that the Bhote Koshi event's embedded media needs (YouTube, Facebook
+ * and X), which frame-src matches for their players and posts. 'unsafe-eval' is
  * required: Knockout (bundled inside @cesium/widgets) resolves the global
  * object with `(0, eval)("this")` at module load, and without it the Cesium
  * widget never initializes (verified in headless Chrome). It also covers
@@ -17,7 +19,9 @@ import { panelBuildPlugin } from './panel.js';
  */
 export const BROWSER_CSP = [
   "default-src 'self'",
-  "script-src 'self' 'unsafe-eval' blob:",
+  // The Bhote Koshi event's embedded media: the YouTube player API, the
+  // Facebook video SDK and X's post widget (src/data/bhoteKoshiEmbeddedMedia.js).
+  "script-src 'self' 'unsafe-eval' blob: https://www.youtube.com https://connect.facebook.net https://platform.twitter.com",
   "style-src 'self' 'unsafe-inline' https://fonts.googleapis.com",
   "font-src 'self' data: https://fonts.gstatic.com",
   "img-src 'self' data: blob: https:",
@@ -25,6 +29,8 @@ export const BROWSER_CSP = [
   "connect-src 'self' blob: data: https: wss: ws:",
   "worker-src 'self' blob:",
   "child-src 'self' blob:",
+  // The same media's players and posts, which load in frames.
+  "frame-src 'self' blob: https://www.youtube-nocookie.com https://www.youtube.com https://www.facebook.com https://platform.twitter.com",
   "manifest-src 'self'",
   "object-src 'none'",
   "base-uri 'self'",
diff --git a/src/tooling/viteBuild.test.mjs b/src/tooling/viteBuild.test.mjs
index c5a1ffa88..8ed4d1f9f 100644
--- a/src/tooling/viteBuild.test.mjs
+++ b/src/tooling/viteBuild.test.mjs
@@ -175,3 +175,48 @@ test('only embed-mode documents may be framed, and only by the allowed ancestors
     assert.equal(plugin.configurePreviewServer, undefined);
   }
 });
+
+test('the CSP admits the event media embeds, and no other script origin', async () => {
+  const { embeddedMediaFrameUrl, resolveEmbeddedMediaSource } =
+    await import('../../src/data/bhoteKoshiEmbeddedMedia.js');
+  const directive = (name) =>
+    BROWSER_CSP.split(';')
+      .map((part) => part.trim())
+      .find((part) => part.startsWith(`${name} `))
+      ?.split(/\s+/)
+      .slice(1) ?? [];
+  const scripts = directive('script-src');
+  const frames = directive('frame-src');
+  // The player API, the Facebook SDK and X's widget script.
+  for (const origin of [
+    'https://www.youtube.com',
+    'https://connect.facebook.net',
+    'https://platform.twitter.com',
+  ])
+    assert.ok(scripts.includes(origin), origin);
+  // Only those three, and never a wildcard or a scheme.
+  assert.deepEqual(
+    scripts.filter(
+      (source) => source.startsWith('http') || source === 'https:',
+    ),
+    [
+      'https://www.youtube.com',
+      'https://connect.facebook.net',
+      'https://platform.twitter.com',
+    ],
+  );
+  assert.ok(!scripts.some((source) => source.includes('*')));
+  // Every frame the event builds for a YouTube or Facebook source is allowed.
+  for (const link of [
+    'https://www.youtube.com/watch?v=dQw4w9WgXcQ',
+    'https://youtu.be/dQw4w9WgXcQ',
+    'https://www.facebook.com/facebook/videos/10153231379946729/',
+  ]) {
+    const source = resolveEmbeddedMediaSource(link);
+    assert.ok(source, link);
+    const origin = new URL(embeddedMediaFrameUrl(source, {})).origin;
+    assert.ok(frames.includes(origin), `${link} -> ${origin}`);
+  }
+  // X posts load in X's own frames.
+  assert.ok(frames.includes('https://platform.twitter.com'));
+});