Security Advisory

CVE-2026-28735

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-22 16:26:04

Last updated 2026-05-22 16:56:09

Assigner Mattermost

CVSS score 5.4

State PUBLISHED

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

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