CVE-2026-20796

LowCVSS 3.1/10Last modified Jun 17, 2026

Description

Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549

Metrics

CVSS 3.1 3.1/10CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-367

Affected software

No affected versions have been published.

Timeline

Published: Feb 13, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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