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    CVE-2026-2578

    Mattermost versions 11.3.x <= 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event.. Mattermost Advisory ID: MMSA-2026-00579

    Published:Mar 16, 2026
    Last Modified:Mar 30, 2026
    EPS:Mar 16, 2026
    EPSS Score:0.00032
    CVSS Score:4.3

    Affected Products

    Vendor
    Mattermost
    Product
    Mattermost Server
    Vendor
    Mattermost
    Product
    Server

    Exploits

    No exploit reference

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    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