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Suggestion detail

Untriaged
Permalink CVE-2026-8823
3.8 LOW
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): High (H)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): Low (L)
  • Availability (A): Low (L)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): High (H)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): Low (L)
  • Modified Availability (MA): Low (L)
created 3 months ago Activity log
  • Created suggestion 3 months ago
User Manager can demote bot accounts to guest without bot-management permission

Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to validate bot targets when demoting users to guests which allows a lower-privileged administrator to degrade arbitrary bot accounts via the standard demote-user API.. Mattermost Advisory ID: MMSA-2026-00669

References

Affected products

Mattermost
  • =<10.11.17
  • ==11.7.1
  • ==11.8.0
  • ==10.11.18
  • =<11.7.0

Matching in nixpkgs

pkgs.mattermost

Open source platform for secure collaboration across the entire software development lifecycle

  • nixos-unstable -
  • nixos-26.05 -

pkgs.mattermostLatest

Open source platform for secure collaboration across the entire software development lifecycle

  • nixos-unstable -
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