CVE-2026-62010 in Avventure Plugin
Summary
by MITRE • 10/29/2026
Unauthenticated PHP Object Injection in Avventure <= 1.1.12 versions.
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability identified as an unauthenticated PHP object injection flaw within the Avventure plugin, specifically affecting versions up to and including 1.1.12, represents a critical security deficiency that allows attackers to execute arbitrary code on the target server without requiring valid credentials or user interaction prior to exploitation. This type of vulnerability stems from the improper handling of serialized data inputs where the application fails to validate or sanitize untrusted input before passing it into PHP's unserialize function. In modern web development, particularly within content management systems like WordPress which this plugin serves, object injection is a severe risk because it can lead directly to remote code execution if an attacker can leverage available gadget chains present in the environment.
From a technical perspective, the core issue lies in how the application processes data submitted through HTTP requests, such as POST parameters or GET variables. When these inputs are deserialized without strict type checking or allowlist validation against known safe classes, an adversary can craft a malicious serialized string containing instances of vulnerable PHP objects. Upon execution by the unserialize function, these objects trigger their magic methods, such as __wakeup, __destruct, or __toString, which may contain logic that interacts with file systems, database connections, or system commands. The absence of authentication for this specific endpoint means that any internet-facing user can attempt to exploit this flaw, significantly lowering the barrier to entry for attackers and increasing the likelihood of successful compromise through automated scanning tools commonly found in threat actor arsenals.
The operational impact of successfully exploiting this vulnerability is severe, potentially resulting in full server takeover, data exfiltration, or defacement of the website. An attacker could inject malicious payloads that create backdoors, install web shells, or manipulate database contents to steal sensitive user information stored by the application. Furthermore, because PHP object injection can often be chained with other vulnerabilities such as cross-site scripting or SQL injection, it serves as a powerful pivot point for deeper network penetration. The lack of authentication exacerbates this risk, making the vulnerability immediately exploitable across the entire internet footprint of any site running the affected version without additional access controls to mitigate initial access attempts.
This flaw aligns with Common Weakness Enumeration (CWE) category CWE-502, which describes Deserialization of Untrusted Data, a widely recognized weakness that frequently leads to remote code execution in Java and PHP environments. Additionally, from an offensive security framework perspective, this vulnerability facilitates the ATT&CK technique T1059, specifically Command and Scripting Interpreter sub-techniques like T1059.004 for Unix-based systems or T1059.007 for Windows, depending on the underlying server operating system. The exploitation path also relates to CWE-284 Improper Access Control since the function allowing deserialization is accessible without proper authentication checks, violating the principle of least privilege and failing to enforce identity verification before processing sensitive operations.
To mitigate this vulnerability, immediate action must be taken by upgrading the Avventure plugin to a version later than 1.1.12 where the developer has presumably patched the insecure deserialization logic. If an upgrade is not immediately feasible due to compatibility constraints, administrators should implement strict input validation and output encoding for all user-supplied data that interacts with internal application functions. It is also advisable to disable or restrict access to any endpoints known to trigger unserialization until a patch can be applied. Furthermore, organizations should consider implementing Web Application Firewalls configured to detect patterns associated with PHP object injection attempts, such as specific serialized string structures containing class names and method calls, to provide an additional layer of defense against exploitation while the underlying code is remediated.