CVE-2026-42603: OWASP BLT: pre-commit-fix.yaml executes untrusted fork code via pull_request_target

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-11 · updated 2026-10-26
Weakness: CWE-94

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

OWASP-BLT BLT: before 2.1.2

References

https://github.com/OWASP-BLT/BLT/security/advisories/GHSA-cgvj-qg2h-cqfh
https://github.com/OWASP-BLT/BLT/security/advisories/GHSA-cgvj-qg2h-cqfh

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