Vulnerability · Published May 11, 2026 · Assigned by GitHub_M
CVE-2026-42603OWASP BLT: pre-commit-fix.yaml executes untrusted fork code via pull_request_target
High 8.8
In plain English
A high-severity code injection in BLT from OWASP-BLT. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.2%top 83.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
OWASP BLT is a QA testing and vulnerability disclosure platform that encompasses websites, apps, git repositories, and more. Prior to 2.1.2, .github/workflows/pre-commit-fix.yaml uses pull_request_target (privileged trigger) but checks out and executes code directly from the attacker's fork, enabling RCE with write permissions. This vulnerability is fixed in 2.1.2.
Affected products (as reported)
Weakness: CWE-94, CWE-95 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://github.com/OWASP-BLT/BLT/security/advisories/GHSA-cgvj-qg2h-cqfh x_refsource_CONFIRM