CVE-2026-55378: Shriyanss Js-Recon

Critical severity, CVSS 9.3. EPSS: 0.8% chance of exploitation in the next 30 days.

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 products

• Shriyanss Js-Recon: from 1.2.1-beta.1, before 1.3.1-beta.2 (fixed in 1.3.1-beta.2)

Published 2026-08-28. Last modified 2026-09-09.