shriyanss js-recon up to 1.3.1-beta.1 PR Branch Checker workflow pr_checker.yml os command injection

Summaryinfo

A vulnerability was found in shriyanss js-recon up to 1.3.1-beta.1. It has been declared as critical. This vulnerability affects unknown code of the file .github/workflows/pr_checker.yml of the component PR Branch Checker workflow. Executing a manipulation of the argument github.head_ref/github.event.pull_request.head.repo.full_name can lead to os command injection. This vulnerability is registered as CVE-2026-55378. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in shriyanss js-recon up to 1.3.1-beta.1 and classified as critical. This vulnerability affects some unknown processing of the file .github/workflows/pr_checker.yml of the component PR Branch Checker workflow. The manipulation of the argument github.head_ref/github.event.pull_request.head.repo.full_name with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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 advisory is available at github.com. This vulnerability was named CVE-2026-55378 since 06/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 1.3.1-beta.2 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• shriyanss

Name

• js-recon

Version

• 1.3.1-beta.0
• 1.3.1-beta.1

CPE 2.3info

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• 🔒

CPE 2.2info

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• 🔒

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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