Skip to content
Fencer Intel
high 7.5

CVE-2025-53548 json

@clerk/backend Performs Insufficient Verification of Data Authenticity

published last yr. modified 4mo ago also EUVD-2025-20865 , GHSA-9mp4-77wg-rwx9

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm @clerk/backend 2.4.0
  • npm @clerk/astro 2.10.2
  • npm @clerk/express 1.7.4
  • npm @clerk/fastify 2.4.4
  • npm @clerk/nextjs 6.23.3
  • npm @clerk/nuxt 1.7.5
  • npm @clerk/react-router 1.6.4
  • npm @clerk/remix 4.8.5
  • npm @clerk/tanstack-react-start 0.18.3
  • clerk astro 2.10.2
  • clerk backend 2.4.0
  • clerk javascript 2.4.0
  • clerk express 1.7.4
  • clerk fastify 2.4.4
  • clerk nextjs 6.23.3
  • clerk nuxt 1.7.5
  • clerk react-router 1.6.4
  • clerk remix 4.8.5
  • clerk tanstack-react-start 0.18.3

Is CVE-2025-53548 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

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

Affected products

  • clerk javascript

Classification

Weakness
  • CWE-345 Insufficient Verification of Data Authenticity

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.