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.

Project Subscriptions

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Advisories

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Fixes

Solution

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Workaround

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History

Wed, 12 Aug 2026 20:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-434
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 12 Aug 2026 13:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-502

Wed, 12 Aug 2026 06:15:00 +0000

Type Values Removed Values Added
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.
Title WooCommerce Subscriptions < 9.1.0 - Unauthenticated RCE via PHP Object Injection
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: WPScan

Published:

Updated: 2026-08-12T19:40:07.711Z

Reserved: 2026-07-30T14:11:55.443Z

Link: CVE-2026-18391

cve-icon Vulnrichment

Updated: 2026-08-12T19:40:04.420Z

cve-icon NVD

Status : Received

Published: 2026-08-12T06:20:14.167

Modified: 2026-08-12T20:17:41.573

Link: CVE-2026-18391

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-12T12:45:02Z

Weaknesses