CVE-2026-14344
Received Received - Intake

Unauthorized Board Creation in Mattermost

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: Mattermost, Inc.

Description
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to enforce the board-creation permission which allows an unauthorized authenticated user to create boards via the board duplicate, boards-and-blocks, and archive-import endpoints.. Mattermost Advisory ID: MMSA-2026-00715

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-14
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-14344
EUVD
EUVD-2026-77364

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mattermost mattermost to 11.9.0 (inc)
mattermost mattermost to 11.8.4 (inc)
mattermost mattermost to 11.7.7 (inc)
mattermost mattermost to 10.11.22 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

Mattermost versions between 11.9.0 and older, 11.8.4 and older, 11.7.7 and older, and 10.11.22 and older fail to enforce the board-creation permission. This allows an unauthorized authenticated user to create boards through specific endpoints like board duplicate, boards-and-blocks, and archive-import.

Impact Analysis

An unauthorized user could create boards in your Mattermost instance, potentially leading to unauthorized data organization, confusion, or misuse of collaborative spaces. This could disrupt workflows or expose sensitive information if boards contain restricted data.

Mitigation Strategies

Update Mattermost to a version that is not affected by this vulnerability. Specifically, upgrade to versions beyond 11.9.0, 11.8.4, 11.7.7, or 10.11.22 depending on your current installation.

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