GitHub Advisoryadvisory · Go

GHSA-jp3f-x449-4q75 Mattermost doesn't enforce client identity binding during the OAuth authorization code redemption flow

LOW Published 2026-05-18 Modified 2026-06-01 Official page ↗
Aliases
CVE-2026-6334
Ecosystem
Go
Packages
github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server
Severity
Low
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N
Weaknesses
CWE-305
Reviewed
2026-06-01

Affected packages

• Go github.com/mattermost/mattermost/server/v8: >= 11.5.0, < 11.5.2 → fixed in 11.5.2 • Go github.com/mattermost/mattermost/server/v8: >= 10.11.0, < 10.11.14 → fixed in 10.11.14 • Go github.com/mattermost/mattermost/server/v8: < 8.0.0-20260318173148-e9ae890a013b → fixed in 8.0.0-20260318173148-e9ae890a013b • Go github.com/mattermost/mattermost-server: < 5.3.2-0.20260318173148-e9ae890a013b → fixed in 5.3.2-0.20260318173148-e9ae890a013b

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce client identity binding during the OAuth authorization code redemption flow which allows an authenticated OAuth client to redeem authorization codes issued to a different client via a crafted token exchange request.. Mattermost Advisory ID: MMSA-2026-00570

Related

Alias · CVE (1)

  • CVE-2026-6334 Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce client identity binding during the OAuth authorization code… vulnerability

Weakness · CWE (1)

  • CWE-305 Authentication Bypass by Primary Weakness weakness

References