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CVE-2026-28735

MEDIUM CVSS: 5.4 Published: 2026-05-22 Modified: 2026-07-23

Description

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

Affected Platforms

Mattermost Mattermost Server

Weakness Type

CWE-863

References