Vulnerabilities CVE-2026-28735

CVE-2026-28735

Medium

Open

TLP:CLEAR

GitHub OAuth Scope Validation

NVD CVE.org

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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

Details

CVSS Score: 5.4
EPSS Score ⓘ: 0.14%

3.6th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Confidence: 90%
Published: May 22, 2026
Last Modified: May 22, 2026

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