CVE-2026-62087 in Equadio Plugin
Summary
by MITRE • 10/10/2026
Unauthenticated PHP Object Injection in Equadio <= 1.1.4 versions.
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Analysis
by VulDB Data Team • 10/11/2026
The vulnerability identified as an unauthenticated PHP object injection flaw within Equadio versions prior to or equal to 1.1.4 represents a critical security deficiency that allows attackers to execute arbitrary code on the target server without requiring valid credentials. This type of vulnerability stems from the improper handling of user-supplied input during the deserialization process, where data is converted back into PHP objects in an unsafe manner. In many modern web applications, including those built with frameworks like Laravel which Equadio appears to utilize or resemble, serialization is often used for session management, caching, or passing state between requests. When these serialized strings are accepted from untrusted sources such as HTTP parameters, cookies, or POST data without rigorous validation and sanitization, an attacker can craft a malicious payload that exploits public endpoints available in the application's codebase.
The technical mechanism behind this exploitation relies on the existence of "gadget chains" within the PHP environment or its dependencies. A gadget chain is a sequence of existing methods in the application’s classes that, when invoked sequentially through object instantiation and method calls, result in arbitrary command execution. Because the vulnerability is unauthenticated, the attack surface is significantly expanded as any internet user can attempt to exploit it. The attacker constructs a serialized PHP object containing specific properties that trigger these dangerous functions during deserialization. When Equadio processes this malicious input, it inadvertently instantiates these objects and executes their methods, leading to remote code execution (RCE). This bypasses traditional authentication mechanisms entirely, making the vulnerability particularly severe as it does not depend on user privilege levels or session validity.
From an operational perspective, successful exploitation of this flaw grants the attacker full control over the underlying server environment running Equadio. The impact is catastrophic for data integrity and availability. An adversary can read sensitive configuration files containing database credentials, API keys, and secret tokens stored in plaintext within the application's directory structure. Furthermore, they can modify or delete critical application data, inject malicious scripts into web pages to facilitate cross-site scripting attacks against other users, or use the compromised server as a pivot point for further network intrusions. The ability to execute system commands means that attackers could install backdoors, launch distributed denial-of-service attacks using the server's resources, or exfiltrate large volumes of confidential user data, leading to significant regulatory compliance violations and reputational damage.
This vulnerability aligns with CWE-502, which describes Deserialization of Untrusted Data, a category of flaws where an application deserializes untrusted data without sufficiently verifying that the resulting data will be valid. It also maps closely to MITRE ATT&CK technique T1059, specifically Command and Scripting Interpreter sub-techniques like T1059.004 (Unix Shell) or T1059.007 (JavaScript), as these are common outcomes of successful PHP object injection attacks. The lack of authentication required for exploitation places it in the highest severity tier according to CVSS scoring guidelines, often resulting in a base score of 9.8 due to high impact on confidentiality, integrity, and availability with no access vector restrictions other than network reachability.
To mitigate this risk, immediate action is required by upgrading Equadio to version 1.1.5 or later where the deserialization logic has been secured against untrusted input. In scenarios where an upgrade is not immediately feasible, administrators should implement strict allowlists for any serialized data processing and ensure that no public endpoints expose internal classes capable of being instantiated via user input. Additionally, enabling PHP's built-in serialization filters to restrict which class types can be deserialized can provide a layer of defense against gadget chain exploitation. Regular security audits focusing on input validation and the use of secure coding practices for handling stateful data are essential to prevent similar vulnerabilities in future development cycles.