CVE-2026-62012 in Coinpress Plugin
Summary
by MITRE • 10/29/2026
Unauthenticated PHP Object Injection in Coinpress <= 1.0.15 versions.
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability identified as an unauthenticated PHP object injection flaw within Coinpress versions up to and including 1.0.15 represents a critical security deficiency that allows remote attackers to execute arbitrary code on the targeted 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 many modern web applications, serialization is used to store complex state or pass data between different parts of an application or across network boundaries. However, when this serialized data originates from untrusted sources and is passed directly to a function like unserialize() without adequate validation or sanitization, it creates a dangerous attack vector that can be exploited by any internet user with access to the vulnerable endpoint.
The technical root cause lies in the presence of PHP magic methods within classes loaded during the deserialization process. Magic methods such as __wakeup(), __destruct(), and __toString() are automatically invoked when an object is unserialized or destroyed. If these methods contain logic that interacts with file systems, executes system commands, or performs database operations based on properties set in the serialized payload, an attacker can craft a malicious serialized string containing a gadget chain. By injecting this crafted input through parameters like cookies, POST data, or URL arguments, the attacker forces the application to instantiate specific classes and trigger these magic methods. This effectively bypasses standard authentication mechanisms because the exploitation occurs at the framework level before any user session validation is typically enforced for certain administrative or internal functions.
From an operational perspective, the impact of this vulnerability is severe and multifaceted. Successful exploitation allows attackers to achieve remote code execution with the privileges of the web server process, which often translates to full control over the underlying operating system. This can lead to complete compromise of the application's data integrity, confidentiality, and availability. Attackers may exfiltrate sensitive user information, including cryptocurrency wallet details or financial records given the nature of Coinpress as a crypto-related platform. Furthermore, the compromised server can be used as a pivot point for further attacks within an internal network, installed with web shells to maintain persistent access, or leveraged to launch distributed denial-of-service attacks against other targets. The unauthenticated nature of this flaw significantly lowers the barrier to entry for attackers, making it susceptible to automated scanning and widespread exploitation in the wild.
This vulnerability aligns closely with Common Weakness Enumeration identifier CWE-502, which describes Deserialization of Untrusted Data. It also maps to several techniques within the MITRE ATT&CK framework, specifically T1078 Valid Accounts if privilege escalation is involved through session manipulation, and more critically T1059 Command Line Interface or T1053 Scheduled Task/Job for executing malicious commands post-exploitation. The lack of input validation during deserialization also touches upon CWE-20 Improper Input Validation. Understanding these mappings helps security teams prioritize remediation efforts by recognizing that this is not merely a coding error but a fundamental architectural flaw in how the application handles external data streams.
To mitigate this vulnerability, immediate action must be taken to upgrade Coinpress to version 1.0.16 or later where the deserialization logic has been secured. In scenarios where an upgrade is not immediately feasible, defensive programming practices should be implemented as a temporary countermeasure. This includes avoiding the use of unserialize() on any data derived from user input entirely. If serialization is necessary for legitimate application functionality, developers should implement strict allow-listing to ensure that only expected class types can be deserialized and consider using JSON encoding instead of PHP's native serialize function where possible. Additionally, implementing Web Application Firewall rules to detect patterns associated with serialized payloads containing magic method calls or known gadget classes can provide an additional layer of defense against exploitation attempts while the underlying code is being patched.