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GHSA-9mp4-77wg-rwx9

HighCVSS 7.5 / 10

Published Jul 9, 2025·Last modified Jul 9, 2025

Affected Components(0)

No affected components available

Description

Impact

Applications that use the verifyWebhook() helper to verify incoming Clerk webhooks are susceptible to accepting improperly signed webhook events.

Patches

@clerk/backend: the helper has been patched as of 2.4.0
@clerk/astro: the helper has been patched as of 2.10.2
@clerk/express: the helper has been patched as of 1.7.4
@clerk/fastify: the helper has been patched as of 2.4.4
@clerk/nextjs: the helper has been patched as of 6.23.3
@clerk/nuxt: the helper has been patched as of 1.7.5
@clerk/react-router: the helper has been patched as of 1.6.4
@clerk/remix: the helper has been patched as of 4.8.5
@clerk/tanstack-react-start: the helper has been patched as of 0.18.3

Resolution

The issue was resolved in @clerk/backend 2.4.0 by:

Properly parsing the webhook request's signatures and comparing them against the signature generated from the received event

Workarounds

If unable to upgrade, developers can workaround this issue by verifying webhooks manually, per this documentation.

Risk Scores

Base Score

7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data.

Threat Intelligence

6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS

0.15%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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