High severity · published Aug 28, 2026
CVE-2026-14558
WP User Frontend < 4.3.10 - Editor+ PHP Object Injection via AI Form Builder
7.2
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UF
User Frontend ·
before 4.3.10 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-14558
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-14558
wpscan.com
https://wpscan.com/vulnerability/217303f4-4363-46f6-8aee-8e0c1aedc271/
More from User Frontend
8.8
CVE-2026-19116
WP User Frontend < 4.3.11 - Subscriber+ PHP Object Injection via Frontend Post Edit Form
7.4
CVE-2026-75823
WP User Frontend 3.5.29 - 4.3.11 - Unauthenticated Privilege Escalation via Registration Role Encryption
5.3
CVE-2026-75824
WP User Frontend 2.5.8 - 4.3.11 - Unauthenticated Account Creation with Registration Disabled
5.3
CVE-2026-17563
WP User Frontend < 4.3.11 - Unauthenticated Post Creation via Subscription-Gated Form
5.3
CVE-2026-14567
WP User Frontend < 4.3.10 - Unauthenticated User Email and Phone Disclosure via User Directory