CVE-2026-97161 in UP Plugin Extension
Summary
by MITRE • 09/26/2026
Joomla Extension - lomart.fr - Various path traversal / file access vectors in UP plugin extension 5.0.0-5.2.0, 6.0.0-6.0.29
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 09/26/2026
The vulnerability identified within the Joomla extension for lomart.fr represents a critical security flaw affecting versions 5.0.0 through 5.2.0 and 6.0.0 through 6.0.29 of the UP plugin. This software component, commonly utilized by website administrators to manage content or user interactions on Joomla-based platforms, contains multiple path traversal and unauthorized file access vectors that compromise the integrity of the underlying server environment. The core technical flaw stems from insufficient input validation and sanitization mechanisms when processing user-supplied data passed through various endpoints exposed by the plugin. Attackers can exploit these weaknesses by crafting malicious requests that manipulate directory traversal sequences, such as dot-dot-slash characters, to bypass intended access controls. This allows them to read arbitrary files on the server filesystem or potentially write content into sensitive locations depending on the specific vector exploited and the permissions of the web service account.
From a technical perspective, this vulnerability aligns with CWE-22 Improper Limitation of a Pathname to a Restricted Directory, which describes scenarios where software does not properly neutralize special elements within file names that could cause files to be located outside of the restricted directory. Additionally, it relates closely to CWE-434 Unrestricted Upload of File with Dangerous Type if the vector allows for uploading malicious scripts, and CWE-200 Exposure of Sensitive Information to an Unauthorized Actor when used merely for reading sensitive configuration or credential files. The lack of rigorous boundary checks on file paths enables attackers to escape the web root directory, potentially accessing system configuration files, database connection strings containing plaintext passwords, or other proprietary source code that should remain inaccessible via HTTP requests.
The operational impact of this vulnerability is severe and multifaceted. If an attacker successfully exploits a read-based path traversal vector, they can exfiltrate sensitive data including administrative credentials stored in Joomla's configuration file, private user information, or internal application logic that aids further exploitation attempts. This initial access often serves as the foothold for more advanced attacks such as remote code execution if writable directories are accessible and upload functionality is present but poorly secured. In a worst-case scenario where write permissions are granted to the web server process, an attacker could inject malicious PHP scripts into publicly accessible directories, leading to full system compromise and control over the entire Joomla installation. This undermines confidentiality, integrity, and availability principles central to information security frameworks.
In terms of threat modeling, this vulnerability maps directly to MITRE ATT&CK technique T1083 File and Directory Discovery, which describes adversaries searching for sensitive files or directories on compromised systems. It also relates to T1567 Data Staged in Cloud Account if the exfiltrated data is sent out via HTTP requests to external servers controlled by the attacker. The exploitation typically requires low privileges within the Joomla application context but can escalate quickly due to the nature of file system access. Automated scanning tools often target these specific version ranges because historical instances of similar vulnerabilities have been widely documented and exploited in the wild, making this a high-risk area for automated attack campaigns targeting outdated or unpatched installations.
Mitigation strategies must prioritize immediate remediation through software updates. Administrators should upgrade the UP plugin extension to the latest patched version that addresses these input validation flaws as soon as possible. If upgrading is not immediately feasible due to compatibility constraints, temporary mitigations include restricting file system permissions for the web server user to prevent writing outside of designated directories and ensuring that directory listing is disabled on the hosting environment. Implementing a Web Application Firewall with rules specifically designed to detect and block path traversal sequences in URL parameters can also provide an additional layer of defense by intercepting malicious requests before they reach the application logic. Regular security audits and code reviews focusing on file handling operations are recommended to prevent similar issues from arising in future updates or custom modifications made to the extension.