7.4

CVE-2026-34076: clerk javascript Server-Side Request Forgery (SSRF)

CVSS: 7.4v3.1HighDeferred
AliasesGHSA-gjxx-92w9-8v8f
Published 01-04-2026Last modified 01-04-2026
Open JSON

Vulnerability summary

CVE-2026-34076 is a high (CVSS 7.4) Server-Side Request Forgery (SSRF) vulnerability in clerk javascript. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 32.4% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.40%
0%100%
Low · +0.09 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 01-04-2026
    PublishedVulnerability first disclosed.
  2. 01-04-2026
    Last modifiedVulnerability information updated.

Description

Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the clerkFrontendApiProxy function in @clerk/backend is vulnerable to Server-Side Request Forgery (SSRF). An unauthenticated attacker can craft a request path that causes the proxy to send the application's Clerk-Secret-Key to an attacker-controlled server. This issue has been patched in @clerk/hono version 0.1.5, @clerk/express version 2.0.7, @clerk/backend version 3.2.3, and @clerk/fastify version 3.1.5.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

+0.09 pp

From 0.31% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.40%

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

@clerk4 products
  • backend≥ 3.0.0, < 3.2.3
  • express≥ 2.0.0, < 2.0.7
  • fastify≥ 3.1.0, < 3.1.5
  • hono≥ 0.1.0, < 0.1.5
Clerk1 product
  • javascript@clerk/hono >= 0.1.0, < 0.1.5 | @clerk/express >= 2.0.0, < 2.0.7 | @clerk/backend >= 3.0.0, < 3.2.3 | @clerk/fastify >= 3.1.0, < 3.1.5

2 vendors · 5 products

References

3 links