CVE-2026-5127 json
User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership & User Registration <= 4.3.1 - Authenticated (Subscriber+) PHP Object Injection
published 2026-05-08 6 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-28538
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
The User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership & User Registration plugin for WordPress is vulnerable to Deserialization of Untrusted Data in versions up to, and including, 4.3.1 This is due to insufficient input validation and type checking on the wpuf_files parameter during form submission, combined with unconditional deserialization via maybe_unserialize() when displaying post content. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary PHP objects, which can be leveraged to execute arbitrary code, delete arbitrary files, or perform other malicious actions if a POP chain is present on the target system.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 6 mo ago
Exploit prediction
0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- wedevs User Frontend: AI Powered Frontend Posting, User Directory, Profile, Membership & User Registration
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/2b5d27cc-c6eb-4c5c-8ee1-30483b91c6fd?source=cve
- plugins.trac.wordpress.org /browser/wp-user-frontend/trunk/wpuf-functions.php#L959
- plugins.trac.wordpress.org /browser/wp-user-frontend/tags/4.2.10/wpuf-functions.php#L959
- plugins.trac.wordpress.org /browser/wp-user-frontend/trunk/wpuf-functions.php#L1103
- plugins.trac.wordpress.org /browser/wp-user-frontend/tags/4.2.10/wpuf-functions.php#L1103
- plugins.trac.wordpress.org /browser/wp-user-frontend/trunk/includes/Traits/FieldableTrait.php#L679
- plugins.trac.wordpress.org /browser/wp-user-frontend/tags/4.2.10/includes/Traits/FieldableTrait.php#L679
- plugins.trac.wordpress.org /browser/wp-user-frontend/trunk/includes/Traits/FieldableTrait.php#L704
- plugins.trac.wordpress.org /browser/wp-user-frontend/tags/4.2.10/includes/Traits/FieldableTrait.php#L704
- plugins.trac.wordpress.org /browser/wp-user-frontend/trunk/includes/Traits/FieldableTrait.php#L429
- plugins.trac.wordpress.org /browser/wp-user-frontend/tags/4.2.10/includes/Traits/FieldableTrait.php#L429
- plugins.trac.wordpress.org /browser/wp-user-frontend/trunk/includes/Traits/FieldableTrait.php#L502
- plugins.trac.wordpress.org /browser/wp-user-frontend/tags/4.2.10/includes/Traits/FieldableTrait.php#L502
- plugins.trac.wordpress.org /browser/wp-user-frontend/trunk/includes/Ajax/Frontend_Form_Ajax.php#L35
- plugins.trac.wordpress.org /browser/wp-user-frontend/tags/4.2.10/includes/Ajax/Frontend_Form_Ajax.php#L35
- plugins.trac.wordpress.org /browser/wp-user-frontend/trunk/includes/Ajax/Frontend_Form_Ajax.php#L36
- plugins.trac.wordpress.org /browser/wp-user-frontend/tags/4.2.10/includes/Ajax/Frontend_Form_Ajax.php#L36
- plugins.trac.wordpress.org /changeset/3514258/wp-user-frontend/trunk/includes/Traits/FieldableTrait.php
- plugins.trac.wordpress.org /changeset?old_path=%2Fwp-user-frontend/tags/4.3.1&new_path=%2Fwp-user-frontend/tags/4.3.2
Sources
- CVE List CVE-2026-5127
- NVD CVE-2026-5127
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.