CVE-2026-28138
Published: 26 February 2026
Summary
CVE-2026-28138 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability. Its CVSS base score is 7.2 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 20.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.
Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.
Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.
Validates or rejects untrusted serialized data before deserialization occurs.
Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.
Integrity verification of serialized information can detect tampering before deserialization occurs.
Provenance of associated data allows detection of untrusted sources before deserialization or processing occurs.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
PHP object injection (deserialization) in a public-facing WordPress plugin directly enables exploitation of the web application (T1190). With admin-level access required, successful exploitation yields RCE or full system compromise, mapping to privilege escalation via the vulnerable component (T1068) and Unix shell command execution on the server (T1059.004).
NVD Description
Deserialization of Untrusted Data vulnerability in Stylemix uListing ulisting allows Object Injection.This issue affects uListing: from n/a through <= 2.2.0.
Deeper analysisAI
CVE-2026-28138 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the Stylemix uListing WordPress plugin, enabling Object Injection. The issue affects uListing versions from n/a through 2.2.0 and was published on 2026-02-26.
Attackers with high privileges (PR:H), such as authenticated administrators, can exploit this vulnerability over the network (AV:N) with low attack complexity (AC:L) and no user interaction (UI:N). Successful exploitation leads to high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H), with an unchanged scope (S:U), as reflected in its CVSS v3.1 base score of 7.2.
The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/ulisting/vulnerability/wordpress-ulisting-plugin-2-2-0-php-object-injection-vulnerability?_s_id=cve details this PHP Object Injection vulnerability in the WordPress uListing plugin version 2.2.0.
Details
- CWE(s)