CVE-2026-16044

—

CVSS 3.1

5.4 medium

EPSS

<1%p7

Published

Aug 17, 2026 (29d ago)

Modified

Aug 18, 2026

Description

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to prevent guest users from receiving Board Admin privileges during board archive import which allows a board member to escalate a guest user to Board Admin via importing a crafted .boardarchive file. Mattermost Advisory ID: MMSA-2026-00672

Vendors: mattermost
Products: mattermost server
Weakness: CWE-863
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

NVD CVE.org GitHub PoCs EPSS (0.2%)

In the news0 stories

No ingested article mentions this CVE yet.