{"id":"CVE-2026-6334","revision":"e960c416e671455ebc4c8744fff2a560","records":[{"revision":"e960c416e671455ebc4c8744fff2a560","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-6334","aliases":[],"title":"OAuth authorization code client binding not enforced during token redemption in Mattermost","description":"Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce client identity binding during the OAuth authorization code redemption flow which allows an authenticated OAuth client to redeem authorization codes issued to a different client via a crafted token exchange request.. Mattermost Advisory ID: MMSA-2026-00570","state":0,"publishedAt":"2026-05-18T06:33:56.008+00:00","modifiedAt":"2026-05-18T14:36:36.905+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:H/UI:R/S:U/C:L/I:L/A:N","score":3.1,"severity":"LOW"}],"references":["https://mattermost.com/security-updates"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-6334","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-6334","identifiers":["CVE-2026-6334"]},"retained":false,"historicalAffected":[]}],"coverage":[]}