CVE-2026-41248
Official Clerk JavaScript SDKs: Middleware-based route protection bypass
Description
Clerk JavaScript is the official JavaScript repository for Clerk authentication. createRouteMatcher in @clerk/nextjs, @clerk/nuxt, and @clerk/astro can be bypassed by certain crafted requests, allowing them to skip middleware gating and reach downstream handlers. This vulnerability is fixed in @clerk/astro 1.5.7, 2.17.10, and 3.0.15; @clerk/nextjs 5.7.6, 6.39.2, and 7.2.1; @clerk/nuxt 1.13.28 and 2.2.2; and @clerk/shared 2.22.1, 3.47.4, anc 4.8.1
INFO
Published Date :
April 24, 2026, 9:16 p.m.
Last Modified :
April 29, 2026, 8:56 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update @clerk/astro to version 1.5.7 or later.
- Update @clerk/nextjs to version 5.7.6 or later.
- Update @clerk/nuxt to version 1.13.28 or later.
- Update @clerk/shared to version 2.22.1 or later.
Public PoC/Exploit Available at Github
CVE-2026-41248 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-41248.
| URL | Resource |
|---|---|
| https://github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-41248 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-41248
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Reproducer labs for vulnerabilities and artifacts analyzed by Hexmortem Labs. Each lab is paired with the published analysis at hexmortem.com/research/.
JavaScript Shell YARA Python
Reproducer labs for vulnerabilities and artifacts analyzed by Binautopsy Labs. Each lab is paired with the published analysis at binautopsy.com/research/.
cve-research cybersecurity detection-rules nodejs-security reproducer security-lab simple-git vulnerability-analysis
Shell YARA JavaScript Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-41248 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-41248 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Apr. 24, 2026
Action Type Old Value New Value Added Description Clerk JavaScript is the official JavaScript repository for Clerk authentication. createRouteMatcher in @clerk/nextjs, @clerk/nuxt, and @clerk/astro can be bypassed by certain crafted requests, allowing them to skip middleware gating and reach downstream handlers. This vulnerability is fixed in @clerk/astro 1.5.7, 2.17.10, and 3.0.15; @clerk/nextjs 5.7.6, 6.39.2, and 7.2.1; @clerk/nuxt 1.13.28 and 2.2.2; and @clerk/shared 2.22.1, 3.47.4, anc 4.8.1 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-436 Added CWE CWE-863 Added Reference https://github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9