Input Validation Flaw in Mattermost Boards Affects Multiple Versions

CVE-2025-20051

What is CVE-2025-20051?

CVE-2025-20051 is a vulnerability identified within the Mattermost Boards application, a collaborative workspace that enables teams to organize tasks and projects effectively. This particular vulnerability arises from an input validation flaw in specific versions of the software, which permits users to read arbitrary files on the system when certain conditions are met. The implications of this flaw can be severe, potentially leading to unauthorized data exposure and compromising the integrity of sensitive information handled by organizations utilizing Mattermost.

Technical Details

The vulnerability affects Mattermost versions 10.4.x up to 10.4.1, 9.11.x up to 9.11.7, 10.3.x up to 10.3.2, and 10.2.x up to 10.2.2. The core issue stems from the application's failure to validate inputs properly during the processes of patching and duplicating a board. As a result, an attacker can exploit this flaw by crafting a specially designed block, enabling them to read internal files on the system inadvertently.

Potential Impact of CVE-2025-20051

1. Unauthorized Data Access: The most immediate risk is unauthorized access to sensitive files, which can contain confidential information impacting user privacy and organizational security.

2. Data Integrity Compromise: If attackers can read critical system files, they might alter configurations or manipulate data, leading to trust issues and potential operational disruptions.

3. Reputation Damage: Organizations suffering from data breaches due to this vulnerability may experience significant reputational harm, undermining client trust and potentially leading to loss of business opportunities.

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