Nixpkgs security tracker

Untriaged

Permalink CVE-2026-3473

5.9 MEDIUM

CVSS version (CVSS): 3.1
Attack Vector (AV): Network (N)
Attack Complexity (AC): High (H)
Privileges Required (PR): Low (L)
User Interaction (UI): None (N)
Scope (S): Unchanged (U)
Confidentiality (C): High (H)
Integrity (I): Low (L)
Availability (A): None (N)
Modified Attack Vector (MAV): Network (N)
Modified Attack Complexity (MAC): High (H)
Modified Privileges Required (MPR): Low (L)
Modified User Interaction (MUI): None (N)
Modified Confidentiality (MC): High (H)
Modified Scope (MS): Unchanged (U)
Modified Integrity (MI): Low (L)
Modified Availability (MA): None (N)

created 1 week, 2 days ago Activity log

Created suggestion 1 week, 2 days ago

Improper file ownership validation in the Boards API allows unauthorised file access

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate file ownership and access control, which allows an authenticated user to access and download files belonging to other users or teams via crafted Boards API requests using valid file IDs.. Mattermost Advisory ID: MMSA-2026-00620

References

MMSA-2026-00620 vendor-advisory

Affected products

Mattermost

==11.4.5
==10.11.15
==11.7.0
=<11.6.0
=<11.5.3
=<11.4.4
==11.5.4
==11.6.1
=<10.11.14

Matching in nixpkgs

pkgs.mattermost

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

nixos-unstable 11.6.1
- nixpkgs-unstable 11.6.1
- nixos-unstable-small 11.6.1
nixos-25.11 10.11.15
- nixos-25.11-small 10.11.15
- nixpkgs-25.11-darwin 10.11.15