Playbooks Plugin Vulnerability in Mattermost by Mattermost
CVE-2026-13411

4.3MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
22 October 2026

What is CVE-2026-13411?

A vulnerability has been identified in Mattermost's Playbooks plugin that impacts specific versions. The issue arises due to the software's failure to properly validate null elements when decoding playbook import conditions. This flaw enables an authenticated attacker to submit a specially crafted import request containing a null condition, potentially leading to a crash of the Playbooks plugin instance-wide. To safeguard your system, it is advisable to apply the latest updates as detailed in Mattermost's advisory.

Affected Version(s)

Mattermost 11.7.0 <= 11.7.11

Mattermost 11.10.0

Mattermost 11.7.12

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
.