All vulnerabilities
CVE-2026-13411

Mattermost: Null condition in Playbooks import crashes the plugin

Mattermost MattermostApplications & CMS
Open in ThreatlineRecord JSON
CVSS
4.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.32%Chance of exploitation activity in the next 30 days, higher than 23% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published22 Oct 2026Updated 22 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

Mattermost versions 11.7.x <= 11.7.11 fail to validate null elements when decoding playbook import conditions which allows an authenticated attacker to crash the Playbooks plugin instance-wide via a crafted import request containing a null condition. Mattermost Advisory ID: MMSA-2026-00709

Text from CVE List

Affected versions 3

  • Mattermostaffected: 11.7.0 through 11.7.11CVE List
  • Mattermostunaffected: 11.10.0CVE List
  • Mattermostunaffected: 11.7.12CVE List

References 1