CVE-2025-20051 is a critical vulnerability affecting several versions of Mattermost, including 10.4.x through 10.4.1, 9.11.x through 9.11.7, 10.3.x through 10.3.2, and 10.2.x through 10.2.2. This vulnerability allows for improper input validation when patching and duplicating a board, leading to unauthorized access to arbitrary files on the system. The implications are significant, as attackers may exploit this vulnerability to read sensitive data.
With a CVSS score of 9.9, this vulnerability is classified as critical. The potential for exploitation is exacerbated by the low attack complexity and the requirement for only low privileges to execute an attack. Organizations running affected versions of Mattermost should act swiftly to remediate this vulnerability to avoid exploitation.
Risk to organizations includes the possibility of unauthorized file access, which can lead to data leaks or further compromise of systems. Given the critical nature of this vulnerability, organizations should prioritize patching immediately.
At present, there are no known public exploits or proof of concept (PoC) available for this vulnerability. However, the lack of such resources does not mitigate the risk involved. Organizations must remain vigilant and take proactive measures to secure their environments against potential future exploits.
Addressing this vulnerability promptly will not only enhance security postures but also prevent potential damage caused by unauthorized access to sensitive files.
Vulnerability Details
The official description for CVE-2025-20051 states that Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, and 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board. This allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.
The CVSS score of 9.9 indicates a critical severity level. The vulnerability is classified under CWE-22, which pertains to improper limitation of a pathname to a restricted directory ('path traversal'). The attack vector is network-based, and the complexity is low, requiring only low privileges and no user interaction.
This vulnerability was first published on February 24, 2025, and remains analyzed with no confirmed public exploits. Organizations should be aware of the potential risks associated with this vulnerability and take appropriate measures to secure their environments.
Technical Analysis
The root cause of CVE-2025-20051 lies in the failure of Mattermost to properly validate input during board patching and duplication processes. This oversight enables attackers to craft malicious inputs that the system does not properly sanitize, allowing unauthorized file access.
The attack vector is through the network, meaning that an attacker can exploit this vulnerability remotely without requiring physical access to the system. The low attack complexity indicates that exploitation does not require sophisticated methods, making it accessible to a wide range of potential attackers.
Privileges required for exploitation are low, as the attacker only needs to have access to a user account to perform the actions necessary for the attack. There is no requirement for user interaction, further increasing the risk as automated attacks could also be executed.
The impacts of this vulnerability are severe, as it affects confidentiality, integrity, and availability. An attacker could gain access to sensitive files, leading to potential data breaches and system compromise.
Risk & Impact Analysis
The risk associated with CVE-2025-20051 is significant, given its potential for unauthorized file access and the critical nature of the data that may be exposed. Organizations relying on affected versions of Mattermost should consider the blast radius of this vulnerability, as it could lead to widespread data leaks or unauthorized access to sensitive information.
Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability. The urgency is further heightened by the potential for exploitation, given the vulnerability's low complexity and the low privileges required for an attack.
Given the critical nature of this vulnerability, organizations must assess their current Mattermost installations and take immediate action to implement necessary patches. Failing to do so could expose them to significant risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Mattermost are affected by this vulnerability: 10.4.x through 10.4.1, 9.11.x through 9.11.7, 10.3.x through 10.3.2, and 10.2.x through 10.2.2. Organizations running these versions should prioritize immediate updates to mitigate associated risks.
Mitigation & Remediation
Organizations are advised to patch their Mattermost installations to the latest supported versions. If immediate patching is not feasible, workarounds should include strict input validation and monitoring for unauthorized access attempts.
For detailed guidance on remediation, organizations can refer to the penetration testing services to identify potential vulnerabilities in their applications.
Detection Guidance
Organizations should monitor logs for unusual access patterns or file read attempts. Behavioral anomalies in the application, especially concerning board duplication processes, should be flagged for further investigation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-20051 highlights the critical need for proper input validation in software applications. As organizations increasingly rely on collaborative tools like Mattermost, ensuring their security becomes paramount.
This vulnerability represents a trend towards exploiting input validation flaws, as attackers seek to leverage weaknesses in application logic to gain unauthorized access. Security teams should take this as a lesson to enhance their validation processes and employ rigorous testing methodologies.
For further insights, organizations can refer to our vulnerability management program design to strengthen their overall security posture.
Additionally, organizations should consider reviewing their penetration testing methodology to identify and mitigate similar vulnerabilities in their systems.
Given the evolving threat landscape, it is crucial for organizations to adopt a proactive approach towards security, ensuring they stay ahead of potential attacks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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