EUVD-2026-28538
GHSA-jc25-ggg4-hhvw
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
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.
AnalysisAI
PHP object injection in User Frontend plugin for WordPress versions up to 4.3.1 allows authenticated attackers with Subscriber-level access or above to achieve remote code execution via unsafe deserialization of the wpuf_files parameter during form submission. The vulnerability chains input validation failures during form processing with unconditional use of maybe_unserialize() when rendering post content, enabling attackers to inject malicious PHP objects that can execute arbitrary code, delete files, or trigger other attacks through available Property-Oriented Programming (POP) chains. …
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RemediationAI
Within 24 hours: Identify all WordPress installations running User Frontend plugin versions up to 4.3.1 and disable the plugin immediately via WordPress admin panel or wp-cli. Within 7 days: Audit access logs and post content for indicators of exploitation (unusual PHP object serialization patterns in wpuf_files parameters); review subscriber account permissions and consider temporary elevation restrictions. …
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External POC / Exploit Code
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