What is GHSA-5736-34m2-3cxc?

GHSA-5736-34m2-3cxc is a security advisory published by GitHub Security Advisories with Critical severity. The WooCommerce Subscriptions WordPress plugin before 9.1.0 does not validate user input before...

Which CVE IDs does GHSA-5736-34m2-3cxc cover?

GHSA-5736-34m2-3cxc covers the following CVE IDs: CVE-2026-18391. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-5736-34m2-3cxc?

GHSA-5736-34m2-3cxc has a CVSS v3 base score of 9.8, published by GitHub Security Advisories.

GHSA-5736-34m2-3cxcCriticalCVSS 9.8

The WooCommerce Subscriptions WordPress plugin before 9.1.0 does not validate user input before...

Vendor

GitHub Security Advisories

Published

August 12, 2026

Last Modified

August 12, 2026

🔗 CVE IDs covered (1)

CVE-2026-18391 →

📋 Description

The WooCommerce Subscriptions WordPress plugin before 9.1.0 does not validate user input before unserializing it on stores with High-Performance Order Storage enabled, leading to a PHP Object Injection issue which unauthenticated users can escalate to Remote Code Execution via a gadget chain present in the bundled dependencies.

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-18391
https://wpscan.com/vulnerability/191f76cf-e5bd-4a37-ac1c-9187cea2aa27
https://github.com/advisories/GHSA-5736-34m2-3cxc