WooCommerce Subscriptions HPOS input permits unauthenticated object injection
WooCommerce Subscriptions from 4.7.0 before the corrected release for the installed branch unserializes unvalidated request input when High-Performance Order Storage is enabled. An unauthenticated attacker can create a PHP object injection payload; the advisory states that a gadget chain in bundled dependencies permits remote code execution. The endpoint or action, request parameter, unserialize call and gadget classes are not disclosed in the public sources.
- Component
- WooCommerce Subscriptions
- Plugin slug
woocommerce-subscriptions- Affected
- 4.7.0 to < 9.1.0
- Safe version
7.9.1, 8.8.2, 9.1.0- Published
- Aug 12, 2026
This CVE was published Aug 12, 2026 and is one of 3 known issues for this plugin.
Update, patch or deactivate.
Update to a fixed release for the installed branch: 7.9.1, 8.8.2, 9.1.0 or later. Review public requests and server files and processes for code-execution indicators, rotate credentials, and rebuild from known-good sources if compromise is suspected.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical 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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H