UpHeron
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Servers and applications

CVE-2026-13411

Null condition in Playbooks import crashes the plugin

Severity
Medium 4.3
Published
22 Oct 2026
Last changed
2 Nov 2026
Added to UpHeron
3 Nov 2026
Fixed in
11.7.12
Sources
NVD, CVE Program

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

Affected software

SoftwareAffected versions
MattermostServers and applications · cna:mattermost|mattermost
  • From 11.7.0 up to 11.7.11
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • From 11.7.0 before 11.7.12

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-13411
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-13411