WP User Frontend permits Subscriber-level PHP object injection
WP User Frontend before 4.3.11 permits user-supplied field values to be deserialized when a submitted post is reopened in the front-end editing form. A Subscriber or higher can inject PHP objects, potentially leading to remote code execution when a suitable gadget chain is present on the site.
- Component
- User Frontend
- Plugin slug
wp-user-frontend- Affected
- < 4.3.11
- Safe version
4.3.11- Published
- Sep 02, 2026
This CVE was published Sep 02, 2026 and is one of 19 known issues for this plugin.
Update, patch or deactivate.
Update to WP User Frontend 4.3.11 or later, inspect front-end submissions for serialized payloads, and review the site for unauthorized code if a usable gadget chain may have been present.
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 User Frontend WordPress plugin before 4.3.11 does not prevent user-supplied field values from being deserialized when a submitted post is reopened in its frontend editing form, allowing authenticated users with subscriber-level access and above to perform PHP Object Injection, which may lead to remote code execution when a suitable gadget chain is present on the site.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H