{"$ref":"https://www.cert.ssi.gouv.fr/openapi.json","affected_systems":[{"description":"Mattermost Server versions 10.11.x ant\u00e9rieures \u00e0 10.11.12","product":{"name":"Mattermost Server","vendor":{"name":"Mattermost","scada":false}}},{"description":"Mattermost Server versions 11.4.x ant\u00e9rieures \u00e0 11.4.1","product":{"name":"Mattermost Server","vendor":{"name":"Mattermost","scada":false}}},{"description":"Mattermost Server versions 11.3.x ant\u00e9rieures \u00e0 11.3.2","product":{"name":"Mattermost Server","vendor":{"name":"Mattermost","scada":false}}},{"description":"Mattermost Server versions 11.2.x ant\u00e9rieures \u00e0 11.2.4","product":{"name":"Mattermost Server","vendor":{"name":"Mattermost","scada":false}}}],"affected_systems_content":"","content":"## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l'\u00e9diteur pour l'obtention des correctifs (cf. section Documentation).","cves":[{"name":"CVE-2026-20719","url":"https://www.cve.org/CVERecord?id=CVE-2026-20719"},{"name":"CVE-2026-27659","url":"https://www.cve.org/CVERecord?id=CVE-2026-27659"},{"name":"CVE-2026-27656","url":"https://www.cve.org/CVERecord?id=CVE-2026-27656"},{"name":"CVE-2026-26233","url":"https://www.cve.org/CVERecord?id=CVE-2026-26233"}],"links":[],"reference":"CERTFR-2026-AVI-0201","revisions":[{"description":"Version initiale","revision_date":"2026-02-24T00:00:00.000000"},{"description":"Ajout r\u00e9f\u00e9rences CVE","revision_date":"2026-03-26T00:00:00.000000"}],"risks":[{"description":"D\u00e9ni de service \u00e0 distance"},{"description":"Injection de requ\u00eates ill\u00e9gitimes par rebond (CSRF)"},{"description":"Non sp\u00e9cifi\u00e9 par l'\u00e9diteur"},{"description":"Contournement de la politique de s\u00e9curit\u00e9"}],"summary":"De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Mattermost Server. Certaines d'entre elles permettent \u00e0 un attaquant de provoquer un d\u00e9ni de service \u00e0 distance, une injection de requ\u00eates ill\u00e9gitimes par rebond (CSRF) et un contournement de la politique de s\u00e9curit\u00e9.","title":"Multiples vuln\u00e9rabilit\u00e9s dans Mattermost Server","vendor_advisories":[{"published_at":"2026-02-24","title":"Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00599","url":"https://mattermost.com/security-updates/"},{"published_at":"2026-02-24","title":"Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2025-00562","url":"https://mattermost.com/security-updates/"},{"published_at":"2026-02-24","title":"Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00598","url":"https://mattermost.com/security-updates/"},{"published_at":"2026-02-24","title":"Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00594","url":"https://mattermost.com/security-updates/"},{"published_at":"2026-02-23","title":"Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2025-00566","url":"https://mattermost.com/security-updates/"},{"published_at":"2026-02-23","title":"Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00578","url":"https://mattermost.com/security-updates/"},{"published_at":"2026-02-24","title":"Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00593","url":"https://mattermost.com/security-updates/"},{"published_at":"2026-02-23","title":"Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00590","url":"https://mattermost.com/security-updates/"},{"published_at":"2026-02-23","title":"Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00595","url":"https://mattermost.com/security-updates/"}]}