Executive Summary

CVE-2026-28138 is a PHP Object Injection vulnerability found in the WordPress uListing Plugin versions up to and including 2.2.0. It allows a malicious actor with administrator privileges to inject objects during deserialization, potentially enabling various attacks.

• The vulnerability involves deserialization of untrusted data leading to object injection.
• It can be exploited to perform attacks such as code injection, SQL injection, path traversal, and denial of service.
• Exploitation requires a suitable PHP Object Injection Property Oriented Programming (POP) chain.

The issue is classified under OWASP Top 10 category A3: Injection and has a CVSS score of 7.2, indicating moderate severity.

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Impact Analysis

If exploited, this vulnerability can allow an attacker with administrator privileges to execute several harmful actions on the affected system.

• Code injection, which could lead to arbitrary code execution.
• SQL injection, potentially compromising the database.
• Path traversal, which might allow access to unauthorized files.
• Denial of service, disrupting the availability of the application.

However, the vulnerability is considered low priority by Patchstack due to its low impact and the unlikelihood of exploitation.

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Compliance Impact

I don't know

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Detection Guidance

There are no specific detection commands or network/system detection methods provided for this vulnerability.

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Mitigation Strategies

Since no official patch is currently available for this vulnerability, immediate mitigation steps include monitoring for updates or mitigations from the plugin developer or security advisories.

Additionally, limiting administrator privileges to trusted users can reduce the risk of exploitation, as the vulnerability requires administrator access.

Consider implementing general security best practices such as regular backups and monitoring for suspicious activity.

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