PT-2026-76669 · Mattermost · Mattermost

Ilent0

·

CVE-2026-16044

·

Published

2026-08-17

·

Updated

2026-08-17

CVSS v3.1

5.4

Medium

VectorAV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Name of the Vulnerable Software and Affected Versions Mattermost versions 11.7.0 through 11.7.6 Mattermost versions 10.11.0 through 10.11.21
Description Insufficient validation during the board archive import process allows a board member to escalate a guest user to Board Admin privileges by importing a specially crafted .boardarchive file.
Recommendations Update Mattermost versions 11.7.0 through 11.7.6 to a version newer than 11.7.6. Update Mattermost versions 10.11.0 through 10.11.21 to a version newer than 10.11.21.

Exploit

Fix

Incorrect Authorization

Found an issue in the description? Have something to add? Feel free to write us 👾
dbugs@ptsecurity.com

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-16044

Affected Products

Mattermost