{"id":"CVE-2026-72723","aliases":["BIT-discourse-2026-72723","EUVD-2026-55660","GHSA-4p6q-h74v-5j7p"],"status":"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.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00525,"percentile":0.44975,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-862"],"published":"2026-08-10T15:56:53Z","modified":"2026-10-28T02:30:57Z","fixes":[{"ecosystem":"Bitnami","package":"discourse","fixed_in":["2026.1.6","2026.5.2","2026.6.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"discourse","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2026.1.6"},{"introduced":"2026.5.0"},{"fixed":"2026.5.2"},{"introduced":"2026.6.0"},{"fixed":"2026.6.1"}]}]}],"products":[{"vendor":"discourse","product":"discourse"}],"references":[{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-4p6q-h74v-5j7p","tags":["x_refsource_CONFIRM","web","advisory"]},{"url":"https://github.com/discourse/discourse/pull/42091","tags":["x_refsource_MISC","web","fix"]},{"url":"https://github.com/discourse/discourse/pull/42092","tags":["x_refsource_MISC","web","fix"]},{"url":"https://github.com/discourse/discourse/pull/42093","tags":["x_refsource_MISC","web","fix"]},{"url":"https://github.com/discourse/discourse/pull/42094","tags":["x_refsource_MISC","web","fix"]},{"url":"https://github.com/discourse/discourse/commit/0248e9ca82d0493037a9ca04d73904ccfad795f9","tags":["x_refsource_MISC","web","fix"]},{"url":"https://github.com/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec2669d7","tags":["x_refsource_MISC","web","fix"]},{"url":"https://github.com/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c723314ac","tags":["x_refsource_MISC","web","fix"]},{"url":"https://github.com/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b89efde","tags":["x_refsource_MISC","web","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72723","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72723.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-72723","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.","status":"published","published":"2026-08-10T15:56:53.723Z","modified":"2026-08-10T21:11:02.865Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:19:51.663093Z"}],"euvd":[{"id":"EUVD-2026-55660","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.","status":"published","published":"2026-08-10T15:56:53Z","modified":"2026-08-10T21:11:02Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T18:02:01.104981Z"}],"nvd":[{"id":"CVE-2026-72723","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.","status":"published","published":"2026-08-10T16:19:49.667Z","modified":"2026-09-08T20:54:37.79Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:12:36.102748Z"}],"osv":[{"id":"CVE-2026-72723","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.","status":"published","published":"2026-08-10T15:56:53.723Z","modified":"2026-10-28T02:30:57.313806127Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T15:45:15.88521Z"},{"id":"BIT-discourse-2026-72723","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.","status":"published","published":"2026-08-17T05:44:24.499Z","modified":"2026-08-17T08:10:54.610975194Z","updated_at":"2026-11-02T15:28:29.152062Z"}]}}