---
id: CVE-2026-55378
title: JS Recon is a JavaScript enumeration and SAST tool
summary: >-
  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 BR…
severity: none
cwe:
  - CWE-78
published: '2026-08-28'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55378'
references:
  - url: >-
      https://github.com/js-recon/js-recon/commit/447876c4bfa9ec5bc98cbc65d7a3e5f889412491
    label: security-advisories@github.com
  - url: 'https://github.com/js-recon/js-recon/pull/121'
    label: security-advisories@github.com
  - url: 'https://github.com/js-recon/js-recon/releases/tag/v1.3.1-beta.2'
    label: security-advisories@github.com
  - url: >-
      https://github.com/js-recon/js-recon/security/advisories/GHSA-w9cj-mg3x-qjm4
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00849
epssPercentile: 0.56306
ingestedAt: '2026-09-09T21:22:45.559Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.