CVE-2026-16044
Medium · 5.4CVSS
5.4
EPSS
0.3%
Published
Aug 17, 2026
CISA due date
—
The record
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
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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