{"id":"CVE-2026-103858","revision":"ca2195ba933d43d6af72f04fa6a94d4b","records":[{"revision":"ca2195ba933d43d6af72f04fa6a94d4b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-103858","aliases":[],"title":"MISP Incomplete Thread Authorization Allows Unauthorized Read and Post Access to Discussions","description":"MISP contains an incomplete authorization check in the discussion posting functionality. When a user submits a post to a thread or replies to an existing post, the application only verified whether the target thread was restricted to a single organization (org-only distribution). It did not enforce the full thread access control list, including sharing-group membership and event-level visibility.\n\nAs a result, an authenticated user who is outside the relevant sharing group or who does not have visibility on the associated event could:\n\n- Read the thread title and the content of the quoted post\n\n- Submit a new post into the discussion thread\n\nThis constitutes both an information disclosure (reading restricted thread and post content) and an integrity issue (injecting content into a thread the user is not authorized to participate in).\n\nAffected: <2.5.48","state":0,"publishedAt":"2026-10-01T11:31:32.84+00:00","modifiedAt":"2026-10-01T15:00:57.587+00:00","affected":[{"ecosystem":"Vendor product","name":"MISP","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"cpes\": [\n                        \"cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"modules\": [\n                        \"PostsController (discussion/thread posting)\"\n                    ],\n                    \"product\": \"MISP\",\n                    \"programFiles\": [\n                        \"app/Controller/PostsController.php\"\n                    ],\n                    \"repo\": \"https://github.com/MISP/MISP\",\n                    \"vendor\": \"MISP\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"2.5.48\",\n                            \"status\": \"affected\",\n                            \"version\": \"unspecified\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/MISP/MISP/commit/79fbd4c75"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103858","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-103858","identifiers":["CVE-2026-103858"]},"retained":false,"historicalAffected":[]}],"coverage":[]}