CVE-2026-65572 in A.Williams Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated PHP Object Injection in A.Williams <= 1.3.1 versions.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 08/06/2026
This vulnerability represents a critical security flaw in the A.Williams plugin for WordPress systems, affecting versions up to and including 1.3.1. The issue stems from improper input validation and sanitization mechanisms that allow attackers to inject malicious PHP objects through unauthenticated requests. When exploited, this vulnerability enables remote code execution capabilities by leveraging the unserialize() function's behavior in PHP applications. The flaw occurs because user-supplied data is directly passed to unserialize() without proper security checks, creating an ideal environment for object injection attacks.
The technical implementation of this vulnerability follows established patterns documented in common weakness enumeration CWE-502 which specifically addresses "Deserialization of Untrusted Data." Attackers can craft malicious serialized objects that, when processed by the vulnerable plugin, trigger unintended code execution. This typically involves creating specially formatted payload data that, upon deserialization, executes arbitrary commands on the target server. The attack vector operates through standard HTTP request parameters or headers where the serialized object data is passed directly to the vulnerable function.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete control over affected WordPress installations. Once exploited, adversaries can execute arbitrary PHP code, potentially leading to data exfiltration, system compromise, or further lateral movement within network environments. The unauthenticated nature of the exploit means that any visitor to the website could potentially trigger the vulnerability without requiring valid credentials. This makes the attack surface extremely broad and increases the likelihood of successful exploitation across multiple systems.
Mitigation strategies for this vulnerability primarily focus on immediate patching of affected versions, with administrators urged to upgrade to patched releases immediately. Additionally, implementing input validation measures at the web application firewall level can help detect and block malicious serialized object attempts. Network-level protections including rate limiting and monitoring for unusual deserialization patterns should be deployed. Security professionals should also consider implementing proper PHP configuration settings that disable dangerous functions like unserialize() when not strictly required. Organizations must ensure their security monitoring systems are capable of detecting anomalous behavior patterns associated with object injection attacks, particularly those aligning with ATT&CK technique T1505.003 for "Obfuscated Files or Information" and T1203 for "Exploitation for Client Execution." Regular security audits and penetration testing should include verification of deserialization handling mechanisms to prevent similar vulnerabilities from being introduced in future software releases.