CVE-2026-18391

9.8 criticalEPSS 1.0%

Critical (9.8). EPSS 1.0% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 1.0% chance of exploitation in the next 30 days; higher than 61% of CVEs (scores of 2026-10-31)
CWE: CWE-434
Published: 2026-08-12
Modified: 2026-08-26
Record from: the NVD, synced 2026-10-19

References

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

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