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CVE-2026-25783
4.3 MEDIUM
- CVSS version: 3.1
- Attack vector (AV): NETWORK
- Attack complexity (AC): LOW
- Privileges required (PR): LOW
- User interaction (UI): NONE
- Scope (S): UNCHANGED
- Confidentiality impact (C): NONE
- Integrity impact (I): NONE
- Availability impact (A): LOW
Denial of service via malformed User-Agent header in getBrowserVersion
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate User-Agent header tokens which allows an authenticated attacker to cause a request panic via a specially crafted User-Agent header. Mattermost Advisory ID: MMSA-2026-00586
References
- MMSA-2026-00586 vendor-advisory
Affected products
Mattermost
- =<11.2.2
- ==11.3.1
- ==10.11.11
- =<10.11.10
- ==11.2.3
- =<11.3.0
- ==11.4.0
Matching in nixpkgs
pkgs.mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle
pkgs.mattermostLatest
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle
pkgs.mattermost-desktop
Mattermost Desktop client
pkgs.python312Packages.mattermostdriver
Python Mattermost Driver
pkgs.python313Packages.mattermostdriver
Python Mattermost Driver
pkgs.python314Packages.mattermostdriver
Python Mattermost Driver
Package maintainers
-
@fsagbuya Florian Agbuya <fa@m-labs.ph>
-
@Kranzes Ilan Joselevich <personal@ilanjoselevich.com>
-
@ryantm Ryan Mulligan <ryan@ryantm.com>
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@numinit Morgan Jones <me+nixpkgs@numin.it>
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@mgdelacroix Miguel de la Cruz <mgdelacroix@gmail.com>
-
@liff Olli Helenius <liff@iki.fi>
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@jokogr Ioannis Koutras <ioannis.koutras@gmail.com>
-
@globin Robin Gloster <mail@glob.in>