{"id":"CVE-2026-27934","summary":"Discourse leaks private topic title and post excerpt via user action API endpoint","details":"Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a lack of visibility checks with a user action API endpoint that results in disclosure of the title and post excerpt to unauthorized users, leading to information disclosure. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.","aliases":["BIT-discourse-2026-27934","GHSA-824f-66wh-xx3g"],"modified":"2026-07-15T02:18:24.420396302Z","published":"2026-03-19T21:17:43.369Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-201"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27934.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27934.json"},{"type":"ADVISORY","url":"https://github.com/discourse/discourse/security/advisories/GHSA-824f-66wh-xx3g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27934"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/discourse/discourse","events":[{"introduced":"322d3c0ac6a8f133b3f82875e9dbbe310f638c1b"},{"fixed":"808b2ac23d8ff421563b40203091026732471c60"},{"introduced":"f7cec86997edc21d6074ceb7666f7e2e6e1b1fdf"},{"fixed":"f38464e46df1b8c51f7d60826502476908d6bb2b"},{"introduced":"896e810e1b296478bba91559a8fc89a9926f11fe"},{"last_affected":"896e810e1b296478bba91559a8fc89a9926f11fe"}],"database_specific":{"extracted_events":[{"introduced":"2026.1.0"},{"fixed":"2026.1.2"},{"introduced":"2026.2.0"},{"fixed":"2026.2.1"},{"introduced":"2026.3.0"},{"last_affected":"2026.3.0"}],"source":["CPE_RANGE","CPE_STRING"],"cpe":["cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*","cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:*"]}}],"versions":["2026.3.0","= 2026.3.0-latest","v2026.1.1","v2026.2.0","v2026.3.0-latest","v2026.1.0","stable","esr","v2026.2.0-latest","v2026.1.0-latest"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27934.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}