CVE-2026-61998 in Le Truffe Plugin
Summary
by MITRE • 10/29/2026
Unauthenticated PHP Object Injection in Le Truffe <= 1.1.7 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 WordPress plugin Le Truffe, specifically affecting versions up to and including 1.1.7, represents a critical security risk that allows attackers to execute arbitrary code on the target server without requiring any form of authentication or user interaction prior to exploitation. This type of vulnerability stems from improper handling of serialized data where user-supplied input is directly passed into PHP's unserialize function without sufficient validation or sanitization checks. In modern web application development, particularly within content management systems like WordPress, plugins often rely on serialization for storing complex state information in cookies, database fields, or transient options. When these inputs are not strictly controlled, an attacker can craft a malicious serialized payload containing instances of classes that have magic methods such as __wakeup, __destruct, or __toString which trigger side effects when the object is unserialized.
The technical mechanism behind this flaw typically involves the exploitation of gadget chains available within the PHP environment and the specific libraries used by the plugin itself. A gadget chain consists of a sequence of existing classes whose methods can be chained together to achieve an arbitrary code execution outcome, such as calling system commands or including malicious files. Because the vulnerability is unauthenticated, it significantly lowers the barrier for entry, allowing any remote actor with network access to the web server to initiate the attack. This contrasts sharply with authenticated vulnerabilities which require compromised credentials, thereby making this flaw particularly dangerous in public-facing environments where automated scanning tools can easily discover and exploit such weaknesses across thousands of installations simultaneously.
From an operational perspective, successful exploitation leads to a complete compromise of the underlying system hosting the WordPress instance. The attacker gains the ability to execute arbitrary commands with the privileges of the web server process, which often translates to full control over the website's files, database contents, and potentially other services running on the same host. This can result in data exfiltration, defacement, installation of backdoors for persistent access, or using the compromised server as a pivot point for further attacks against internal network resources. The impact extends beyond immediate technical damage to include severe reputational harm for site owners and potential legal liabilities if sensitive user data is exposed due to the breach.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-470, which describes untrusted input in object instantiation or deserialization processes. It also maps closely to MITRE ATT&CK technique T1059, specifically sub-techniques related to command and script interpretation such as PowerShell or Bash execution via system calls triggered through the PHP runtime. The lack of authentication places it within the initial access phase of an attack lifecycle, often preceding privilege escalation if the web server user has elevated permissions on the operating system file structure.
Mitigation strategies must prioritize immediate remediation by updating the Le Truffe plugin to a version greater than 1.1.7 where this issue is resolved through proper input validation and safe deserialization practices. In scenarios where an update cannot be applied immediately, administrators should consider disabling the specific functionality that triggers the vulnerable code path or implementing web application firewall rules designed to detect and block malicious serialized payloads containing known dangerous class names or method calls. Long-term architectural improvements involve avoiding PHP's native unserialize function for untrusted data entirely, opting instead for safer serialization formats like JSON which do not support object instantiation during parsing, thereby eliminating this attack vector at the language level.