{"id":"CVE-2026-6333","revision":"5ed55c70b58e403188f9bda2d221f129","records":[{"revision":"5ed55c70b58e403188f9bda2d221f129","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-6333","aliases":[],"title":"SSRF via Host Header Spoofing in Custom Slash Commands","description":"Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost Advisory ID: MMSA-2026-00582","state":0,"publishedAt":"2026-05-18T08:41:29.342+00:00","modifiedAt":"2026-05-19T17:19:42.466+00:00","affected":[{"ecosystem":"Vendor product","name":"Mattermost","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"product\": \"Mattermost\",\n                    \"vendor\": \"Mattermost\",\n                    \"versions\": [\n                        {\n                            \"lessThanOrEqual\": \"11.5.1\",\n                            \"status\": \"affected\",\n                            \"version\": \"11.5.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThanOrEqual\": \"10.11.13\",\n                            \"status\": \"affected\",\n                            \"version\": \"10.11.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"11.6.0\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"11.5.2\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"10.11.14\",\n                            \"status\": \"unaffected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N","score":3.5,"severity":"LOW"}],"references":["https://mattermost.com/security-updates"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-6333","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-6333","identifiers":["CVE-2026-6333"]},"retained":false,"historicalAffected":[]}],"coverage":[]}