Denial of Service Vulnerability in Mattermost Boards Plugin
CVE-2026-13417

4.3MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
14 September 2026

What is CVE-2026-13417?

An issue in Mattermost's Boards plugin allows authenticated users with editor permissions to exploit a failure in type validation for fields.properties. This can lead to the crashing of the Boards plugin worker, resulting in a denial of service. The vulnerability is present in multiple versions of Mattermost, highlighting the need for prompt updates to mitigate the risk.

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:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

alimursaliyev
.