7.5

CVE-2025-53548: clerk javascript

CVSS: 7.5v3.1HighDeferred
AliasesGHSA-9mp4-77wg-rwx9
Published 09-07-2025Last modified 09-07-2025
Open JSON

Vulnerability summary

CVE-2025-53548 is a high (CVSS 7.5) vulnerability in clerk javascript. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.1% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.17%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-07-2025
    PublishedVulnerability first disclosed.
  2. 09-07-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

+0.02 pp

From 0.15% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

@clerk9 products
  • astro≥ 2.9.0, < 2.10.2
  • backend≥ 2.0.0, < 2.4.0
  • express≥ 1.6.0, < 1.7.4
  • fastify≥ 2.3.0, < 2.4.4
  • nextjs≥ 6.2.10, < 6.23.3
Clerk1 product

2 vendors · 10 products

References

3 links