CVE-2026-65573 in Abelle Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated PHP Object Injection in Abelle <= 1.22 versions.
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Analysis
by VulDB Data Team • 08/06/2026
This vulnerability represents a critical security flaw in the Abelle content management system affecting versions 1.22 and earlier, where unauthenticated remote code execution becomes possible through improper handling of serialized PHP objects. The vulnerability stems from insufficient input validation and sanitization within the application's object serialization mechanisms, allowing attackers to inject malicious serialized data that gets processed without proper authentication checks. When the application deserializes user-controllable input, it executes arbitrary PHP code with the privileges of the web server process, creating a severe escalation path for attackers who can leverage this flaw to gain full system compromise.
The technical implementation of this vulnerability aligns with CWE-502, which describes unsafe handling of serialized data in programming languages. Attackers can exploit this by crafting malicious serialized objects that contain malicious PHP code within their properties or methods, bypassing authentication mechanisms entirely since the injection occurs at the object level rather than through traditional input validation points. The flaw operates through the standard PHP unserialize() function being called on user-supplied data without adequate sanitization, enabling attackers to manipulate the object graph during deserialization and execute arbitrary commands on the target system.
From an operational perspective, this vulnerability creates a significant risk for organizations using affected Abelle versions, as it allows attackers to execute code remotely without requiring valid credentials. The impact extends beyond simple data theft to include complete system compromise, backdoor installation, and potential lateral movement within network environments. Security professionals should note that unlike many other vulnerabilities, this flaw does not require authentication or specific user interaction, making it particularly dangerous for publicly accessible web applications. The exploitation typically involves sending specially crafted HTTP requests containing serialized PHP objects that trigger the vulnerable deserialization code path.
Organizations should immediately implement mitigations including updating to versions of Abelle that address this vulnerability, applying proper input validation and sanitization at all entry points, and implementing network segmentation to limit exposure. Additional defensive measures include disabling dangerous PHP functions like unserialize() where possible, implementing web application firewalls with signature-based detection for known malicious patterns, and conducting comprehensive security assessments of all PHP applications to identify similar deserialization vulnerabilities. The ATT&CK framework categorizes this type of vulnerability under T1548.001 for abuse of untrusted libraries and T1059.007 for command and script injection techniques, highlighting the importance of proper object serialization handling in modern web security practices.