Vulnerability record · CVE-2026-55378 · published 28 August 2026

CVE-2026-55378: OS command injection vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.85% · top 43.5% CWE-78 · OS command injection Deferred

9.3CVSS 4.0 base score

0.85%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

4References

9 Sep 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

Link	Tags
https://github.com/js-recon/js-recon/commit/447876c4bfa9ec5bc98cbc65d7a3e5f889412491
https://github.com/js-recon/js-recon/pull/121
https://github.com/js-recon/js-recon/releases/tag/v1.3.1-beta.2
https://github.com/js-recon/js-recon/security/advisories/GHSA-w9cj-mg3x-qjm4

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Source: NIST National Vulnerability Database (record CVE-2026-55378), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.