CVE-2026-28138

HighRCE

Published: 26 February 2026

Published

26 February 2026

Modified

15 April 2026

KEV Added

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Patch

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CVSS Score v3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0007 20.5th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

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 20.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and AC-6 (Least Privilege).

Deeper analysis

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.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-8847

Vulnerability details

Deserialization of Untrusted Data vulnerability in Stylemix uListing ulisting allows Object Injection.This issue affects uListing: from n/a through <= 2.2.0.

CWE(s): CWE-502

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

T1059.004 Unix Shell Execution

Adversaries may abuse Unix shell commands and scripts for execution.

attack.mitre.org →

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).

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1