CVE-2026-59079 in Edito
Summary
by MITRE • 11/13/2026
Edito CMS restricts the ability to upload files via the UI to specific file types. However, an avatar upload functionality allows an attacker to upload files of any type and extension without restriction. This issue was fixed in version 5.10.2607. Hotfixes for older versions (5.8) have also been released.
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Analysis
by VulDB Data Team • 11/13/2026
The vulnerability identified within Edito CMS represents a critical failure in input validation mechanisms, specifically categorized under CWE-434: Unrestricted Upload of File with Dangerous Type. This flaw arises from an inconsistency between the general file upload restrictions enforced by the user interface and the specific implementation of the avatar upload functionality. While the application correctly restricts uploads to predefined safe extensions for most features, the avatar module fails to apply these same sanitization checks, allowing attackers to bypass security controls entirely.
From a technical perspective, this issue stems from improper access control or missing validation logic within the backend handler responsible for processing avatar submissions. Instead of verifying that the uploaded file matches an allowlist of safe extensions such as jpg, png, or gif, the system accepts any MIME type and extension provided by the client. This lack of server-side enforcement means that malicious actors can upload executable scripts, including PHP, ASPX, or JSP files, directly to a directory accessible via HTTP.
The operational impact of this vulnerability is severe, as it typically leads to Remote Code Execution (RCE). By uploading a web shell disguised as an image file with a modified extension, an attacker gains the ability to execute arbitrary commands on the underlying server operating system. This can result in complete compromise of the affected system, including unauthorized access to sensitive data, modification or deletion of critical files, and potential pivoting into other parts of the internal network. In many cases, this vulnerability is exploited as part of a broader attack chain involving privilege escalation or lateral movement within enterprise environments.
This type of flaw aligns with MITRE ATT&CK technique T1505.003: Web Shell, where attackers install web shells to maintain persistent access and execute commands on compromised systems. The absence of strict file extension validation is a common root cause for such techniques in content management systems that handle user-generated media assets.
To mitigate this vulnerability, organizations must ensure they are running Edito CMS version 5.10.2607 or later, which includes the necessary patches to enforce consistent upload restrictions across all modules. For users of older versions like 5.8, applying the specific hotfixes released by the vendor is essential. Additionally, implementing defense-in-depth strategies such as configuring web servers to deny execution permissions in directories containing user uploads can significantly reduce the risk of exploitation even if a malicious file bypasses initial validation checks. Regular security audits and static code analysis should also be employed to detect similar inconsistencies in other upload functionalities within the application.