Deserialization Object Injection in codetipi Valenti

Executive Summary

CVE-2026-23544 is a PHP Object Injection vulnerability found in the WordPress Valenti Theme versions up to and including 5.6.3.5. It allows an attacker to inject malicious code by exploiting the deserialization of untrusted data. This can lead to various attacks such as code injection, SQL injection, path traversal, and denial of service if a suitable PHP Object Injection Property Oriented Programming (POP) chain is available.

The vulnerability requires contributor or developer privileges to exploit and falls under the OWASP Top 10 category A3: Injection.

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Impact Analysis

If exploited, this vulnerability can allow a malicious actor to perform several harmful actions including:

• Code injection
• SQL injection
• Path traversal
• Denial of service

These impacts can compromise the security and availability of your website, potentially leading to data breaches, unauthorized access, or service outages.

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Compliance Impact

I don't know

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Detection Guidance

CVE-2026-23544 is a PHP Object Injection vulnerability affecting the WordPress Valenti Theme up to version 5.6.3.5. Detection typically involves monitoring for exploitation attempts that use PHP Object Injection techniques.

While no specific detection commands are provided, users can monitor web server logs for suspicious requests that may indicate attempts to exploit object injection, such as unusual serialized PHP objects or payloads in POST or GET parameters.

Applying the mitigation rule issued by Patchstack can also help detect and block exploitation attempts.

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Mitigation Strategies

Since no official patch exists yet for CVE-2026-23544, the immediate recommended step is to apply the mitigation rule provided by Patchstack to block exploitation attempts.

Users should apply this mitigation immediately to protect their websites from potential code injection, SQL injection, path traversal, denial of service, and other attacks enabled by this vulnerability.

Additionally, monitoring for suspicious activity and restricting contributor or developer privileges can reduce the risk of exploitation.

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