{"id":"CVE-2026-6673","revision":"2d090fbe8f8647ccbc7733f5acb79c5c","records":[{"revision":"2d090fbe8f8647ccbc7733f5acb79c5c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-6673","aliases":[],"title":"Mattermost Jira plugin had unauthenticated {{/ac/installed}} lifecycle callback during pending Jira Cloud install","description":"Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integration via POST to /ac/installed during the pending-install window.. Mattermost Advisory ID: MMSA-2026-00654","state":0,"publishedAt":"2026-06-22T13:38:56.594+00:00","modifiedAt":"2026-06-22T15:41:08.511+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\": \"11.7.0\",\n                            \"status\": \"affected\",\n                            \"version\": \"11.7.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThanOrEqual\": \"11.6.2\",\n                            \"status\": \"affected\",\n                            \"version\": \"11.6.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThanOrEqual\": \"11.5.5\",\n                            \"status\": \"affected\",\n                            \"version\": \"11.5.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThanOrEqual\": \"10.11.17\",\n                            \"status\": \"affected\",\n                            \"version\": \"10.11.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"11.8.0\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"11.7.1\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"11.6.3\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"11.5.6\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"10.11.18\",\n                            \"status\": \"unaffected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H","score":6.4,"severity":"MEDIUM"}],"references":["https://mattermost.com/security-updates"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-6673","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-6673","identifiers":["CVE-2026-6673"]},"retained":false,"historicalAffected":[]}],"coverage":[]}