CVE-2026-55378CWE-78command-injection

CVE-2026-55378

published August 29, 2026

CVSS
9.3
EPSS
1%
Percentile
57.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
9.3 · NONE
CVSS v4.0
9.3 · 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
EPSS
0.00849 · 57.7th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-08-29T00:18Z
References (4)
https://github.com/js-recon/js-recon/commit/447876c4bfa9ec5bc98cbc65d7a3e5f889412491 · [email protected]https://github.com/js-recon/js-recon/pull/121 · [email protected]https://github.com/js-recon/js-recon/releases/tag/v1.3.1-beta.2 · [email protected]https://github.com/js-recon/js-recon/security/advisories/GHSA-w9cj-mg3x-qjm4 · [email protected]
EPSS history
Timeline
  • 30 AUG 16:18Z
    EPSS moved — → 1%
    epss
  • 28 AUG 18:15Z
    JS Recon: Command injection in PR Branch Checker workflow via untrusted pull request context values
    cvelistv5