{"id":"CVE-2026-72723","state":"PUBLISHED","title":"Discourse: Anonymous sidebar serialization exposes descriptions of category-restricted tags","description":"Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, SiteSerializer.anonymous_default_navigation_menu_tags serializes tags from SiteSetting.default_navigation_menu_tags without applying DiscourseTagging.filter_visible for the anonymous viewer. An unauthenticated user can retrieve restricted tag names and descriptions through /site.json when those tags are limited by inaccessible categories, category tag groups, or tag-group permissions. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.","publishedAt":"2026-08-10T15:56:53.723Z","updatedAt":"2026-08-10T21:11:02.865Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["discourse discourse"],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"version":"< 2026.1.6","status":"affected"},{"version":">= 2026.5.0-latest, < 2026.5.2","status":"affected"},{"version":">= 2026.6.0-latest, < 2026.6.1","status":"affected"},{"version":">= 2026.7.0-latest, < 2026.7.0","status":"affected"}]}],"references":["https://github.com/discourse/discourse/security/advisories/GHSA-4p6q-h74v-5j7p","https://github.com/discourse/discourse/pull/42091","https://github.com/discourse/discourse/pull/42092","https://github.com/discourse/discourse/pull/42093","https://github.com/discourse/discourse/pull/42094","https://github.com/discourse/discourse/commit/0248e9ca82d0493037a9ca04d73904ccfad795f9","https://github.com/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec2669d7","https://github.com/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c723314ac","https://github.com/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b89efde"],"weaknesses":["CWE-862"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72723.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72723","state":"PUBLISHED","datePublished":"2026-08-10T15:56:53.723Z","dateUpdated":"2026-08-10T21:11:02.865Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-10T13:48:09.545Z"},"containers":{"cna":{"title":"Discourse: Anonymous sidebar serialization exposes descriptions of category-restricted tags","descriptions":[{"lang":"en","value":"Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, SiteSerializer.anonymous_default_navigation_menu_tags serializes tags from SiteSetting.default_navigation_menu_tags without applying DiscourseTagging.filter_visible for the anonymous viewer. An unauthenticated user can retrieve restricted tag names and descriptions through /site.json when those tags are limited by inaccessible categories, category tag groups, or tag-group permissions. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0."}],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"version":"< 2026.1.6","status":"affected"},{"version":">= 2026.5.0-latest, < 2026.5.2","status":"affected"},{"version":">= 2026.6.0-latest, < 2026.6.1","status":"affected"},{"version":">= 2026.7.0-latest, < 2026.7.0","status":"affected"}]}],"references":[{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-4p6q-h74v-5j7p","name":"https://github.com/discourse/discourse/security/advisories/GHSA-4p6q-h74v-5j7p","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/discourse/discourse/pull/42091","name":"https://github.com/discourse/discourse/pull/42091","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/pull/42092","name":"https://github.com/discourse/discourse/pull/42092","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/pull/42093","name":"https://github.com/discourse/discourse/pull/42093","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/pull/42094","name":"https://github.com/discourse/discourse/pull/42094","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/0248e9ca82d0493037a9ca04d73904ccfad795f9","name":"https://github.com/discourse/discourse/commit/0248e9ca82d0493037a9ca04d73904ccfad795f9","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec2669d7","name":"https://github.com/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec2669d7","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c723314ac","name":"https://github.com/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c723314ac","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b89efde","name":"https://github.com/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b89efde","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862: Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-10T15:56:53.723Z"},"source":{"advisory":"GHSA-4p6q-h74v-5j7p","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-10T19:02:43.987708Z","id":"CVE-2026-72723","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-10T21:11:02.865Z"}}]}}}