diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ea1a1c05540..d3145bf7c4ab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,15 @@
+<a name="20.3.14"></a>
+
+# 20.3.14 (2025-11-25)
+
+### http
+
+| Commit                                                                                           | Type | Description                                          |
+| ------------------------------------------------------------------------------------------------ | ---- | ---------------------------------------------------- |
+| [0276479e7d](https://github.com/angular/angular/commit/0276479e7d0e280e0f8d26fa567d3b7aa97a516f) | fix  | prevent XSRF token leakage to protocol-relative URLs |
+
+<!-- CHANGELOG SPLIT MARKER -->
+
 <a name="20.3.13"></a>
 
 # 20.3.13 (2025-11-19)
diff --git a/package.json b/package.json
index 5f4b2e356fa0..f9e0f10ccdb1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "angular-srcs",
-  "version": "20.3.13",
+  "version": "20.3.14",
   "private": true,
   "description": "Angular - a web framework for modern web apps",
   "homepage": "https://github.com/angular/angular",
diff --git a/packages/common/http/src/xsrf.ts b/packages/common/http/src/xsrf.ts
index 88d0781aabd2..1d38594d4e10 100644
--- a/packages/common/http/src/xsrf.ts
+++ b/packages/common/http/src/xsrf.ts
@@ -82,11 +82,15 @@ export class HttpXsrfCookieExtractor implements HttpXsrfTokenExtractor {
   }
 }
 
+/**
+ * Regex to match absolute URLs, including protocol-relative URLs.
+ */
+const ABSOLUTE_URL_REGEX = /^(?:https?:)?\/\//i;
+
 export function xsrfInterceptorFn(
   req: HttpRequest<unknown>,
   next: HttpHandlerFn,
 ): Observable<HttpEvent<unknown>> {
-  const lcUrl = req.url.toLowerCase();
   // Skip both non-mutating requests and absolute URLs.
   // Non-mutating requests don't require a token, and absolute URLs require special handling
   // anyway as the cookie set
@@ -95,8 +99,7 @@ export function xsrfInterceptorFn(
     !inject(XSRF_ENABLED) ||
     req.method === 'GET' ||
     req.method === 'HEAD' ||
-    lcUrl.startsWith('http://') ||
-    lcUrl.startsWith('https://')
+    ABSOLUTE_URL_REGEX.test(req.url)
   ) {
     return next(req);
   }
diff --git a/packages/common/http/test/xsrf_spec.ts b/packages/common/http/test/xsrf_spec.ts
index 0db531a862af..fe1b002baad1 100644
--- a/packages/common/http/test/xsrf_spec.ts
+++ b/packages/common/http/test/xsrf_spec.ts
@@ -70,6 +70,23 @@ describe('HttpXsrfInterceptor', () => {
     expect(req.request.headers.has('X-XSRF-TOKEN')).toEqual(false);
     req.flush({});
   });
+
+  it('does not apply XSRF protection when request is absolute', () => {
+    interceptor
+      .intercept(new HttpRequest('POST', 'https://example.com/test', {}), backend)
+      .subscribe();
+    const req = backend.expectOne('https://example.com/test');
+    expect(req.request.headers.has('X-XSRF-TOKEN')).toBeFalse();
+    req.flush({});
+  });
+
+  it('does not apply XSRF protection when request is protocol relative', () => {
+    interceptor.intercept(new HttpRequest('POST', '//example.com/test', {}), backend).subscribe();
+    const req = backend.expectOne('//example.com/test');
+    expect(req.request.headers.has('X-XSRF-TOKEN')).toBeFalse();
+    req.flush({});
+  });
+
   it('does not overwrite existing header', () => {
     interceptor
       .intercept(