CVE-2026-65579 in Agricola Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated PHP Object Injection in Agricola <= 1.21.0 versions.
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Analysis
by VulDB Data Team • 08/06/2026
This vulnerability represents a critical security flaw in the Agricola WordPress plugin version 1.21.0 and earlier, where unauthenticated PHP object injection occurs due to improper input validation and sanitization of user-supplied data. The vulnerability stems from the plugin's failure to properly sanitize serialized objects received through HTTP parameters, allowing attackers to inject malicious PHP objects that can be deserialized without authentication requirements.
The technical implementation involves the exploitation of PHP's serialize/unserialize functions within the plugin's codebase, where user-controllable input is directly passed to unserialize() without proper validation or sanitization. This creates a pathway for remote code execution as attackers can craft serialized objects containing malicious payloads that execute when the object is deserialized by the application. The vulnerability specifically affects parameters that handle serialized data structures, typically used for storing complex data types within the plugin's functionality.
The operational impact of this vulnerability extends beyond simple data manipulation, as it provides attackers with potential full system compromise capabilities. An unauthenticated attacker can leverage this weakness to execute arbitrary code on the target server, potentially leading to complete system takeover, data exfiltration, or establishment of persistent backdoors. The vulnerability affects WordPress installations running vulnerable versions of the Agricola plugin, making it particularly dangerous in environments where multiple sites are hosted on shared infrastructure. This type of vulnerability aligns with CWE-502 which specifically addresses deserialization of untrusted data and maps to attack techniques in the ATT&CK framework under T1548.003 for abuse of unquoted service names and T1059.007 for scripting languages.
Mitigation strategies should prioritize immediate patching of the Agricola plugin to versions that properly sanitize serialized input and implement proper validation before deserialization occurs. Administrators should also implement additional security measures including web application firewalls, input validation at multiple layers, and monitoring for suspicious deserialization patterns. The vulnerability highlights the importance of following secure coding practices such as avoiding direct unserialization of user input, implementing strict type checking, and using alternative serialization methods that do not allow arbitrary object instantiation. Organizations should also conduct comprehensive security assessments of all installed plugins to identify similar vulnerabilities, as this represents a common pattern in vulnerable applications where proper input sanitization is lacking at critical data handling points.