{"id":"CVE-2026-27481","summary":"Discourse: Hidden tag visibility bypass on tag routes","details":"Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authorization bypass vulnerability allows unauthenticated or unauthorized users to view hidden (staff-only) tags and its associated data. All Discourse instances with tagging enabled and staff-only tag groups configured are impacted. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.","aliases":["BIT-discourse-2026-27481","GHSA-6c9x-3vrp-682x"],"modified":"2026-07-27T03:56:38.481379344Z","published":"2026-04-03T21:27:12.156Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27481.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-200"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27481.json"},{"type":"ADVISORY","url":"https://github.com/discourse/discourse/security/advisories/GHSA-6c9x-3vrp-682x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27481"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/discourse/discourse","events":[{"introduced":"322d3c0ac6a8f133b3f82875e9dbbe310f638c1b"},{"fixed":"b3f024ce9587e678216892cbd967201b2450e197"},{"introduced":"f7cec86997edc21d6074ceb7666f7e2e6e1b1fdf"},{"fixed":"4431801e7b5af883edb430643fdace7608ffb6fb"},{"introduced":"896e810e1b296478bba91559a8fc89a9926f11fe"},{"fixed":"896e810e1b296478bba91559a8fc89a9926f11fe"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"2026.1.0-latest"},{"fixed":"2026.1.3"},{"introduced":"2026.2.0-latest"},{"fixed":"2026.2.2"},{"introduced":"2026.3.0-latest"},{"fixed":"2026.3.0"}]}}],"versions":["2026.3.0","v2026.1.2","v2026.2.1","v2026.1.1","v2026.2.0","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-2026-27481.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}