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Medium WID-SEC-2025-2880 5 CVEs

Mattermost Server und Desktop: Mehrere Schwachstellen

Published Dec 17, 2025 · Updated Feb 26, 2026 · Revision 2 · de-DE

Vendor: Mattermost Product: Mattermost Platform: Linux Platform: Windows

Summary

Ein Angreifer kann mehrere Schwachstellen in Mattermost Server und Desktop ausnutzen, um Informationen offenzulegen, Sicherheitsmechanismen zu umgehen und um einen Denial of Service Zustand herbeizuführen.

Product

Mattermost ist ein webbasierter Instant-Messaging-Dienst.

Vulnerabilities 5

  • Medium 6.8
    CVE-2025-14435

    Application-Level DoS via infinite re-render loop in user profile handling

    Mattermost versions 10.11.x <= 10.11.8, 11.1.x <= 11.1.1, 11.0.x <= 11.0.6 fail to prevent infinite re-renders on API errors which allows authenticated users to cause application-level DoS via triggering unbounded component re-render loops.

    Mattermost Mattermost github.com/mattermost/mattermost-server Go
  • Medium 6.5
    CVE-2025-12689

    DoS in Calls plugin via malformed UTF-8 in WebSocket request

    Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.

    Mattermost Mattermost github.com/mattermost/mattermost-plugin-calls Go
  • Low 3.9
    CVE-2025-13326

    Mattermost Desktop App fails to enable Hardened Runtime when packaged for Mac App Store

    Mattermost Desktop App versions <6.0.0 fail to enable the Hardened Runtime on the Mattermost Desktop App when packaged for Mac App Store which allows an attacker to inherit TCC permissions via copying the binary to a tmp folder.

    Mattermost Mattermost
  • Low 3.3
    CVE-2025-13321

    Mattermost Desktop App logging sensitive information and fails to clear data on server deletion

    Mattermost Desktop App versions <6.0.0 fail to sanitize sensitive information from Mattermost logs and clear data on server deletion which allows an attacker with access to the users system to gain access to potentially sensitive information via reading the a…

    Mattermost Mattermost mattermost-desktop npm
  • Low 3.1
    CVE-2025-14822

    DoS from quadratic complexity in model.ParseHashtags

    Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens

    Mattermost Mattermost github.com/mattermost/mattermost-server Go

Revision history

  1. #2

    Neue Informationen von Mattermost aufgenommen

  2. #1

    Initiale Fassung

References