# @clerk/backend Performs Insufficient Verification of Data Authenticity

Advisory record · `GHSA-9mp4-77wg-rwx9`

- **Identifiers:** `GHSA-9mp4-77wg-rwx9` · `CVE-2025-53548`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-345](https://cwe.mitre.org/data/definitions/345.html)
- **Tags:** [CWE-345](https://agentprime.io/advisories/tag/cwe-345.md)
- **Published:** 9 Jul 2025
- **Updated:** 9 Jul 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Jul 2025, 18:07 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

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

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0017, the 6th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 9 Jul 2025. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-9mp4-77wg-rwx9](https://github.com/advisories/GHSA-9mp4-77wg-rwx9)
- [OSV: GHSA-9mp4-77wg-rwx9](https://osv.dev/vulnerability/GHSA-9mp4-77wg-rwx9)
- <https://github.com/clerk/javascript/security/advisories/GHSA-9mp4-77wg-rwx9>
- <https://nvd.nist.gov/vuln/detail/CVE-2025-53548>
- <https://github.com/clerk/javascript>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-9mp4-77wg-rwx9>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-9mp4-77wg-rwx9/>. Everything for agents: <https://agentprime.io/llms.txt>.