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mwickett merged 2 commits into from
Jul 21, 2026
+26 −20
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fix(nextjs): remove redundant protection CSP source #9207

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614bacd
fix(nextjs): use Clerk wildcard for protection CSP
mwickett Jul 21, 2026
4eb82e6
fix(nextjs): keep protection CSP wildcard scoped
mwickett Jul 21, 2026
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5 changes: 5 additions & 0 deletions .changeset/swift-plums-cover.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@clerk/nextjs': patch
---

Remove the redundant `https://*.client.protect.clerk.com` source from CSP headers generated by `clerkMiddleware()`.
33 changes: 17 additions & 16 deletions packages/nextjs/src/server/__tests__/content-security-policy.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -31,11 +31,11 @@ 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 https://*.client.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(
"frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com https://*.client.protect.clerk.com",
"frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com",
);
expect(directives).toContainEqual("img-src 'self' https://img.clerk.com");
expect(directives).toContainEqual("style-src 'self' 'unsafe-inline'");
Expand Down Expand Up @@ -78,15 +78,16 @@ describe('CSP Header Utils', () => {
expect(cspHeader[1]).toContain(`'nonce-${nonceHeader[1]}'`);
});

it('should allow Clerk abuse and fraud protection origins in default and strict modes', () => {
it('should allow Clerk subdomains needed for abuse and fraud protection in default and strict modes', () => {
for (const strict of [false, true]) {
const result = createContentSecurityPolicyHeaders(testHost, { strict });
const directives = result.headers[0][1].split('; ');

for (const directiveName of ['script-src', 'connect-src', 'frame-src']) {
const directive = directives.find(d => d.startsWith(directiveName));
expect(directive).toContain('https://*.protect.clerk.com');
expect(directive).toContain('https://*.client.protect.clerk.com');
const directiveSources = directives.find(d => d.startsWith(directiveName))?.split(' ');
expect(directiveSources).toContain('https://*.protect.clerk.com');
expect(directiveSources).not.toContain('https://*.clerk.com');
expect(directiveSources).not.toContain('https://*.client.protect.clerk.com');
}

if (strict) {
Expand All @@ -110,11 +111,11 @@ 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 https://*.client.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(
"frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com https://*.client.protect.clerk.com",
"frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com",
);
expect(directives).toContainEqual("img-src 'self' https://img.clerk.com");
expect(directives).toContainEqual("style-src 'self' 'unsafe-inline'");
Expand Down Expand Up @@ -259,7 +260,7 @@ 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 https://*.client.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 @@ -269,7 +270,7 @@ describe('CSP Header Utils', () => {
expect(imgSrcDirective).toContain('https://images.example.com');

expect(directives).toContainEqual(
`frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com https://*.client.protect.clerk.com https://frames.example.com`,
`frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com https://frames.example.com`,
);
});

Expand All @@ -279,12 +280,12 @@ 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 https://*.client.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'");
expect(directives).toContainEqual(
"frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com https://*.client.protect.clerk.com",
"frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com",
);
expect(directives).toContainEqual("img-src 'self' https://img.clerk.com");
expect(directives).toContainEqual("style-src 'self' 'unsafe-inline'");
Expand Down Expand Up @@ -325,11 +326,11 @@ 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 https://*.client.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(
`frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com https://*.client.protect.clerk.com`,
`frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com`,
);

expect(directives).toContainEqual(`default-src 'self'`);
Expand Down Expand Up @@ -391,12 +392,12 @@ 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 https://*.client.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'");
expect(directives).toContainEqual(
"frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com https://*.client.protect.clerk.com value1 value2",
"frame-src 'self' https://challenges.cloudflare.com https://*.js.stripe.com https://js.stripe.com https://hooks.stripe.com https://*.protect.clerk.com value1 value2",
);
expect(directives).toContainEqual("img-src 'self' https://img.clerk.com");
expect(directives).toContainEqual("style-src 'self' 'unsafe-inline'");
Expand Down
8 changes: 4 additions & 4 deletions packages/nextjs/src/server/content-security-policy.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
import { constants } from '@clerk/backend/internal';

const clerkProtectionOrigins = ['https://*.protect.clerk.com', 'https://*.client.protect.clerk.com'];
const clerkProtectionOrigin = 'https://*.protect.clerk.com';

/**
* Valid CSP directives according to the CSP Level 3 specification
Expand Down Expand Up @@ -105,7 +105,7 @@ class ContentSecurityPolicyDirectiveManager {
'https://maps.googleapis.com',
'https://img.clerk.com',
'https://images.clerkstage.dev',
...clerkProtectionOrigins,
clerkProtectionOrigin,
],
'default-src': ['self'],
'form-action': ['self'],
Expand All @@ -115,7 +115,7 @@ class ContentSecurityPolicyDirectiveManager {
'https://*.js.stripe.com',
'https://js.stripe.com',
'https://hooks.stripe.com',
...clerkProtectionOrigins,
clerkProtectionOrigin,
],
'img-src': ['self', 'https://img.clerk.com'],
'script-src': [
Expand All @@ -127,7 +127,7 @@ class ContentSecurityPolicyDirectiveManager {
'https://*.js.stripe.com',
'https://js.stripe.com',
'https://maps.googleapis.com',
...clerkProtectionOrigins,
clerkProtectionOrigin,
],
'style-src': ['self', 'unsafe-inline'],
'worker-src': ['self', 'blob:'],
Expand Down
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