CVE-2026-18391

critical · 9.8

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.

9.8

CVSS

1.0%

EPSS (exploit prob.)

60th

EPSS percentile

2026-08-12

Published

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

Weaknesses

CWE-434

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-18391