CVE-2026-19116 User Frontend CVE debrief

Who should care

Defenders responsible for WordPress installations with the User Frontend plugin should assess the exposure of subscriber-level access and above users and prioritize verifying the presence of the vulnerable plugin version.

Why it matters

The User Frontend WordPress plugin vulnerability allows authenticated users to perform PHP Object Injection, potentially leading to remote code execution. Defenders should prioritize verifying the presence of the vulnerable plugin version and assessing the exposure of subscriber-level access and above users.

• Remote code execution may occur when a suitable gadget chain is present on the site.
• PHP Object Injection attacks can lead to unauthorized access and data breaches.
• Subscriber-level access and above users are potentially affected, increasing the attack surface.
• Verification of plugin version and user access levels is necessary to determine exposure.

Technical summary

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. This vulnerability affects WordPress installations with the User Frontend plugin, and defenders should prioritize verifying the presence of the vulnerable plugin version and assessing the exposure of subscriber-level access and above users.

Defensive priority

Defenders should prioritize verifying the presence of the vulnerable plugin version and assessing the exposure of subscriber-level access and above users.

Recommended defensive actions

• Verify the version of the User Frontend WordPress plugin and update to 4.3.11 or later if necessary.
• Assess the exposure of subscriber-level access and above users to the vulnerable plugin.
• Implement additional security measures to prevent PHP Object Injection attacks.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The official CVE record description explicitly mentions 'User Frontend WordPress plugin' as the affected component. The NVD entry is currently Deferred. Defenders should verify the presence of the vulnerable plugin version and assess the exposure of subscriber-level access and above users. The CVE record was published on 2026-09-02T06:17:16.643Z and has not been modified since then. Evidence from the CVE Program and NVD detail page support this assessment.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.