by Kastro
Paper/Archive/CVE-2026-55378

CVE-2026-55378

shriyanss js-recon — JS Recon: Command injection in PR Branch Checker workflow via untrusted pull request context values

EPSS 0.8%CVSS 9.3
critical.is priorityof 100
40
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 58.1.581 × 2011.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

JS Recon is a JavaScript enumeration and SAST tool. From 1.2.1-beta.1 until 1.3.1-beta.2, the PR Branch Checker workflow in .github/workflows/pr_checker.yml places github.head_ref and github.event.pull_request.head.repo.full_name into BRANCH_NAME and SOURCE_REPO and interpolates those untrusted values into a shell gh pr comment command. A remote user who opens a pull request can use shell metacharacters in a branch or fork name to execute commands in the GitHub Actions runner with the workflow's GITHUB_TOKEN, which has pull-requests write permission. This issue is fixed in version 1.3.1-beta.2.

Affected

ProductAffectedFixed inSource
js-recon>= 1.2.1-beta.1, < 1.3.1-beta.2–CNA

Scores by source

GitHub_M (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/js-recon/js-recon/security/advisories/GHSA-w9cj-mg3x-qjm4refgithub.com/js-recon/js-recon/pull/121refgithub.com/js-recon/js-recon/commit/447876c4bfa9ec5bc98cbc65d7a3e5f889412491refgithub.com/js-recon/js-recon/releases/tag/v1.3.1-beta.2