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CVE-2026-6334

LOW CVSS: 3.1 Published: 2026-05-18 Modified: 2026-06-17

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

Affected Platforms

Mattermost Mattermost Server

Weakness Type

CWE-305

References