Authorization Flaw in Mattermost Affects Board Creation
CVE-2026-14344

4.3MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
14 September 2026

What is CVE-2026-14344?

An authorization flaw in Mattermost allows unauthorized authenticated users to create boards using various endpoints such as board duplicate, boards-and-blocks, and archive-import. This vulnerability undermines the intended permissions associated with board creation, posing potential risks to data integrity and user management within Mattermost environments.

Affected Version(s)

Mattermost 11.9.0

Mattermost 11.8.0 <= 11.8.4

Mattermost 11.7.0 <= 11.7.7

References

https://mattermost.com/security-updates
vendor-advisory

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

c4b8a133-e345-4bbe-9a44-d1ef0938de51
.