CVE-2026-62006 in Nuts Plugin
Summary
by MITRE • 10/29/2026
Unauthenticated PHP Object Injection in Nuts <= 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 Nuts versions prior to or equal to 1.12 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 deserialization of user-supplied data, where the application accepts input and passes it directly into PHP's unserialize function or similar mechanisms without sufficient validation or sanitization. In the context of Nuts, a content management system built upon the Symfony framework, this flaw likely resides in components that handle session management, configuration parsing, or plugin interactions, allowing an external actor to craft malicious serialized objects that exploit available gadget chains within the application's dependencies.
From a technical perspective, PHP object injection occurs when untrusted data is deserialized into PHP objects, enabling the attacker to manipulate internal properties and trigger magic methods such as __wakeup, __destruct, or __toString. These methods often contain logic for resource cleanup, file operations, or network connections that can be abused to achieve remote code execution. The absence of authentication requirements significantly lowers the barrier to entry for attackers, transforming this from a complex privilege escalation issue into a straightforward exploitation vector accessible via standard HTTP requests. Attackers can leverage known gadget chains present in common PHP libraries used by Nuts, such as Guzzle or SwiftMailer, to chain method calls that ultimately result in arbitrary command execution on the underlying operating system.
The operational impact of this vulnerability is severe, potentially leading to complete compromise of the web server hosting the Nuts instance. An attacker with successful exploitation capabilities can read sensitive files containing database credentials and administrative passwords, modify website content to deface pages or inject malicious scripts for cross-site scripting attacks against visitors, and use the compromised server as a pivot point for further network intrusion. Additionally, the persistence achieved through backdoors installed via this method allows long-term unauthorized access, facilitating data exfiltration of user information stored within the CMS database. This aligns with common attack patterns observed in web application exploitation where initial code execution leads to broader system compromise and lateral movement.
This vulnerability is categorized under CWE-502, which denotes Deserialization of Untrusted Data, a classification that highlights the fundamental error of trusting input data during object reconstruction processes. Furthermore, it maps directly to MITRE ATT&CK technique T1059.004, specifically Command and Scripting Interpreter: PHP, as well as T1078.003 for Valid Accounts if authentication bypass is involved in related contexts, though the primary vector here relies on unauthenticated access. The exploitation also relates to CWE-20 Improper Input Validation, indicating that the application failed to verify the integrity and origin of the serialized data before processing it.
Mitigation strategies must prioritize immediate patching by upgrading Nuts to a version greater than 1.12 where this deserialization flaw has been addressed through stricter input validation or the removal of dangerous functions from accessible entry points. For organizations unable to upgrade immediately, implementing strict web application firewall rules that detect and block known malicious serialized payloads can provide temporary protection. Additionally, developers should ensure that all third-party libraries are updated to their latest secure versions to eliminate potential gadget chains used in exploitation attempts. Enabling comprehensive logging and monitoring for unusual HTTP request patterns involving large or malformed POST bodies containing base64 encoded strings can aid in early detection of attempted exploits before successful compromise occurs.