CVE-2026-14558 WP User Frontend < 4.3.10 - Editor+ PHP Object Injection via AI Form Builder
Editors can inject PHP objects via AI Form Builder, potentially leading to remote code execution if a POP chain exists.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-14558?
CVE-2026-14558 is a high-severity unsafe deserialization vulnerability in Unknown User Frontend, published on 28 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The User Frontend WordPress plugin before 4.3.10 does not properly validate field type definitions and deserialises user-controlled post metadata when rendering submitted posts, allowing users with Editor-level access and above to inject arbitrary PHP objects, which can lead to remote code execution when a suitable POP chain is present on the site.
Weakness: CWE-502
Which versions are affected by CVE-2026-14558?
How do I fix CVE-2026-14558?
No fix has been published for CVE-2026-14558 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-14558 being exploited?
There is no known exploitation of CVE-2026-14558 in the wild and no public exploit code.
Sources
Also known as GHSA-j5mw-m2j3-5747.