CVE-2026-66568 in Original Plugin
Summary
by MITRE • 10/10/2026
Unauthenticated PHP Object Injection in Original <= 1.9.0 versions.
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Analysis
by VulDB Data Team • 10/10/2026
The vulnerability identified as an unauthenticated PHP object injection flaw within the original software package prior to version 1.9.0 represents a critical security deficiency rooted in improper deserialization practices. This type of vulnerability arises when an application accepts user-controllable input and passes it directly into a function that reconstructs PHP objects from serialized data without adequate validation or sanitization. In the context of this specific flaw, the lack of authentication requirements means that any remote actor on the network can trigger the vulnerable code path without needing to provide valid credentials, significantly lowering the barrier for exploitation and expanding the attack surface to include untrusted users.
From a technical perspective, PHP object injection exploits the internal workings of the language's serialization mechanism, particularly when combined with magic methods such as __wakeup(), __destruct(), or __toString(). When an attacker supplies a crafted serialized string containing references to specific classes available within the application environment, they can manipulate these objects during the deserialization process. If the application does not strictly validate the class names and property values contained in the input against a whitelist of expected types, the interpreter will instantiate arbitrary objects. This allows for control over object properties, which can be leveraged to execute unintended side effects or chain with other vulnerable methods within the codebase to achieve remote code execution.
The operational impact of this vulnerability is severe, as it effectively grants an attacker full administrative control over the affected system depending on the privileges under which the PHP process runs. By chaining object injection vulnerabilities with existing application logic, attackers can often bypass security controls and execute arbitrary commands on the underlying operating system. This leads to a complete compromise of confidentiality, integrity, and availability for the hosted web applications and potentially the entire server infrastructure. Sensitive data stored in databases or file systems becomes accessible, and the compromised host may be used as a pivot point for further lateral movement within the network.
This flaw aligns with Common Weakness Enumeration identifier CWE-502, which describes Deserialization of Untrusted Data, and is frequently associated with CWE-913 if it involves improper control of dynamically determined code paths. In terms of offensive security frameworks, this vulnerability facilitates techniques categorized under MITRE ATT&CK Tactic TA0004 (Privilege Escalation) and specifically the technique T1059 Command and Scripting Interpreter, as attackers utilize the injection to execute system commands. The unauthenticated nature also maps directly to initial access vectors where low-privilege actors can gain high-level access without prior authentication steps.
To mitigate this vulnerability, immediate remediation requires upgrading the original software package to version 1.9.0 or any later release that addresses these deserialization flaws. For applications unable to upgrade immediately, implementing strict input validation is essential; developers should ensure that only whitelisted class names and property values are allowed during deserialization operations. Utilizing PHP's built-in serialization filters with allow_classes set to false can prevent the instantiation of arbitrary objects entirely. Additionally, applying cryptographic signatures or integrity checks to serialized data ensures that payloads have not been tampered with by unauthorized parties before they reach the deserializer.