Vulnerability · Published Aug 12, 2026 · Assigned by WPScan
CVE-2026-18391WooCommerce Subscriptions < 9.1.0 - Unauthenticated RCE via PHP Object Injection
Critical 9.8
In plain English
A critical-severity unrestricted file upload in WooCommerce Subscriptions from Unknown. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)1.0%top 38.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | WooCommerce Subscriptions | 4.7.0 – before 9.1.0 |
Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://wpscan.com/vulnerability/191f76cf-e5bd-4a37-ac1c-9187cea2aa27/ exploit, vdb-entry, technical-description