{"id":"CVE-2026-13411","title":"Null condition in Playbooks import crashes the plugin","summary":"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 nu…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-754"],"vendor":"Mattermost","product":"Mattermost","affected":["Mattermost >= 11.7.0 <= 11.7.11"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-22T12:53:48.632686Z"},"published":"2026-10-22","updated":"2026-10-22","sourceUpdated":"2026-10-22T13:37:46.805Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-13411","references":[{"url":"https://mattermost.com/security-updates","label":"MMSA-2026-00709"}],"tags":["cve.org"],"ingestedAt":"2026-10-22T11:37:02.350Z","epss":0.00321,"epssPercentile":0.24928,"slug":"CVE-2026-13411","body":"## Overview\n\nMattermost 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\n\n## Affected\n\n- `Mattermost >= 11.7.0 <= 11.7.11`\n\n## Remediation\n\nUpdate Mattermost to versions 11.10.0, 11.7.12 or higher.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}