CVE Feed

    Dashboard / CVE / CVE-2026-6957

    CVE-2026-6957

    Mattermost Plugins versions <=1.1.5 fail to sanitize filenames received from federated peers before using them to construct export destination paths, which allows an administrator of a remote federated Mattermost server to write files to arbitrary locations within the target server's filestore via a malicious filename delivered through the shared-channel attachment sync protocol. Mattermost Advisory ID: MMSA-2026-00659

    Published:May 27, 2026
    Last Modified:Jun 2, 2026
    EPS:May 27, 2026
    EPSS Score:0.00056
    CVSS Score:8

    Affected Products

    Vendor
    Mattermost
    Product
    Legal Hold
    Vendor
    Mattermost
    Product
    Mattermost

    Exploits

    No exploit reference

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High