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fix(nextjs): allow Clerk protection hosts on all ports in connect-src #9458

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fix(nextjs): allow Clerk protection hosts on all ports in connect-src #9458

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631545b
fix(nextjs): allow Clerk protection hosts on all ports in connect-src
mwickett Aug 14, 2026
2c628d6
test(nextjs): condense the connect-src comment to a single line
mwickett Aug 14, 2026
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5 changes: 5 additions & 0 deletions .changeset/dull-donkeys-warn.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@clerk/nextjs': patch
---

Allow Clerk's abuse and fraud protection hosts on all ports in the generated `connect-src` directive. The `contentSecurityPolicy` option previously emitted `https://*.protect.clerk.com`, which matches port 443 only, so requests to those hosts on other ports were blocked by the resulting policy.
21 changes: 13 additions & 8 deletions packages/nextjs/src/server/__tests__/content-security-policy.test.ts
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Expand Up @@ -31,7 +31,7 @@ describe('CSP Header Utils', () => {

expect(directives).toContainEqual("default-src 'self'");
expect(directives).toContainEqual(
"connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com clerk.example.com",
"connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com:* clerk.example.com",
);
expect(directives).toContainEqual("form-action 'self'");
expect(directives).toContainEqual(
Expand Down Expand Up @@ -83,9 +83,14 @@ describe('CSP Header Utils', () => {
const result = createContentSecurityPolicyHeaders(testHost, { strict });
const directives = result.headers[0][1].split('; ');

for (const directiveName of ['script-src', 'connect-src', 'frame-src']) {
// connect-src carries the port wildcard: those hosts are also requested on non-443 ports.
for (const [directiveName, expectedSource] of [
['script-src', 'https://*.protect.clerk.com'],
['connect-src', 'https://*.protect.clerk.com:*'],
['frame-src', 'https://*.protect.clerk.com'],
]) {
const directiveSources = directives.find(d => d.startsWith(directiveName))?.split(' ');
expect(directiveSources).toContain('https://*.protect.clerk.com');
expect(directiveSources).toContain(expectedSource);
expect(directiveSources).not.toContain('https://*.clerk.com');
expect(directiveSources).not.toContain('https://*.client.protect.clerk.com');
}
Expand All @@ -111,7 +116,7 @@ describe('CSP Header Utils', () => {
const directives = headerValue.split('; ');
expect(directives).toContainEqual("default-src 'self'");
expect(directives).toContainEqual(
"connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com clerk.example.com",
"connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com:* clerk.example.com",
);
expect(directives).toContainEqual("form-action 'self'");
expect(directives).toContainEqual(
Expand Down Expand Up @@ -260,7 +265,7 @@ describe('CSP Header Utils', () => {

const directives = result.headers[0][1].split('; ');
expect(directives).toContainEqual(
`connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com clerk.example.com https://api.example.com`,
`connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com:* clerk.example.com https://api.example.com`,
);

const imgSrcDirective = directives.find(d => d.startsWith('img-src')) || '';
Expand All @@ -280,7 +285,7 @@ describe('CSP Header Utils', () => {
const directives = result.headers[0][1].split('; ');

expect(directives).toContainEqual(
"connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com clerk.example.com",
"connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com:* clerk.example.com",
);
expect(directives).toContainEqual("default-src 'self'");
expect(directives).toContainEqual("form-action 'self'");
Expand Down Expand Up @@ -326,7 +331,7 @@ describe('CSP Header Utils', () => {
const directives = result.headers[0][1].split('; ');

expect(directives).toContainEqual(
`connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com clerk.example.com`,
`connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com:* clerk.example.com`,
);
expect(directives).toContainEqual(`img-src 'self' https://img.clerk.com`);
expect(directives).toContainEqual(
Expand Down Expand Up @@ -392,7 +397,7 @@ describe('CSP Header Utils', () => {
const directives = result.headers[0][1].split('; ');

expect(directives).toContainEqual(
"connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com clerk.example.com",
"connect-src 'self' https://clerk-telemetry.com https://*.clerk-telemetry.com https://api.stripe.com https://maps.googleapis.com https://img.clerk.com https://images.clerkstage.dev https://*.protect.clerk.com:* clerk.example.com",
);
expect(directives).toContainEqual("default-src 'self'");
expect(directives).toContainEqual("form-action 'self'");
Expand Down
4 changes: 3 additions & 1 deletion packages/nextjs/src/server/content-security-policy.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,8 @@
import { constants } from '@clerk/backend/internal';

const clerkProtectionOrigin = 'https://*.protect.clerk.com';
// A source with no port matches port 443 only, and these hosts are also requested on other ports.
const clerkProtectionConnectOrigin = `${clerkProtectionOrigin}:*`;

/**
* Valid CSP directives according to the CSP Level 3 specification
Expand Down Expand Up @@ -105,7 +107,7 @@ class ContentSecurityPolicyDirectiveManager {
'https://maps.googleapis.com',
'https://img.clerk.com',
'https://images.clerkstage.dev',
clerkProtectionOrigin,
clerkProtectionConnectOrigin,
],
'default-src': ['self'],
'form-action': ['self'],
Expand Down
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