CVE-2026-56066 in Adaptive Images Plugin
Summary
by MITRE • 06/26/2026
Unauthenticated Arbitrary File Deletion in ShortPixel Adaptive Images <= 3.11.4 versions.
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Analysis
by VulDB Data Team • 06/26/2026
The vulnerability in ShortPixel Adaptive Images plugin affects versions up to and including 3.11.4 where an unauthenticated attacker can exploit a flaw to delete arbitrary files on the target WordPress installation. This represents a critical security weakness that bypasses authentication requirements and allows remote file system manipulation. The vulnerability stems from insufficient input validation and access control mechanisms within the plugin's file handling routines, specifically in how it processes file deletion requests without proper user authentication or authorization checks.
The technical implementation of this flaw involves the plugin's inability to verify the legitimacy of file deletion commands issued through its web interface or API endpoints. Attackers can craft malicious requests that target specific file paths within the WordPress directory structure, potentially leading to removal of critical system files, configuration data, or even the complete plugin installation itself. The vulnerability is particularly dangerous because it operates without requiring any valid user credentials or session tokens, making it accessible to anyone who can reach the vulnerable plugin interface.
This weakness directly maps to CWE-22 - Improper Limitation of a Pathname to a Restricted Directory and CWE-73 - External Control of File Name or Path, both of which are fundamental security principles that govern file system operations. The vulnerability aligns with attack patterns categorized under ATT&CK technique T1486 - Data Encrypted for Ransom, as the ability to delete arbitrary files can serve as a precursor to ransomware deployment or complete system compromise. The operational impact extends beyond simple file deletion, potentially enabling attackers to disrupt service availability, gain deeper system access through corrupted files, or create conditions that facilitate further exploitation.
Organizations running affected versions of ShortPixel Adaptive Images face significant risk exposure, particularly in environments where the plugin is actively used for image optimization and adaptive image delivery. The vulnerability can be exploited through various attack vectors including direct web interface access, automated scanning tools, or integration with larger attack frameworks targeting WordPress installations. Mitigation strategies should include immediate upgrade to version 3.11.5 or later, which implements proper authentication checks and input validation. Additionally, administrators should review file permissions and implement network-level restrictions to limit access to plugin interfaces, while monitoring for suspicious file deletion activities in system logs. The fix typically involves implementing proper user authentication verification before processing any file manipulation requests, along with sanitizing all input parameters to prevent path traversal attacks that could extend the scope of potential damage beyond intended targets.