Nixpkgs security tracker

Untriaged

Permalink CVE-2026-28735

5.4 MEDIUM

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

created 2 days, 7 hours ago Activity log

Created suggestion 2 days, 7 hours ago

GitHub OAuth Scope Validation

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 the OAuth token scope on the callback which allows an authenticated Mattermost user to gain access to private repositories via modifying the scope parameter in the GitHub authorization URL.. Mattermost Advisory ID: MMSA-2026-00628

References

MMSA-2026-00628 vendor-advisory

Affected products

Mattermost

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

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 11.7.0
nixos-25.11 10.11.17
- nixos-25.11-small 10.11.17
- nixpkgs-25.11-darwin 10.11.17