CVE-2026-18391

WooCommerce Subscriptions < 9.1.0 - Unauthenticated RCE via PHP Object Injection

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.

Affected

WooCommerce Subscriptions

CVSS v3.1 CNA

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.96% chance of exploitation in the next 30 days, 61st percentile

Published

2026-08-12

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/191f76cf-e5bd-4a37-ac1c-9187cea2aa27/

References

• CVE Record
• NVD entry