{"id":"CVE-2026-72722","title":"Discourse is an open-source discussion platform","summary":"Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, TopicLink.extract_from, TopicLink.ensure_entry_for, and TopicLink.duplicate_lookup do not consistently enforce Guardian.can_see? checks…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-862"],"published":"2026-08-10","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:54:37.790","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72722","references":[{"url":"https://github.com/discourse/discourse/commit/45abd925e46e8be40d2d047bced26628f26e4e31","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/commit/7d7ce546ac86e24a6512b321ace69fc52fe37bf4","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/commit/836a251d54a1004fb1c463a7d299b933b176191f","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/commit/e54ba27eacee0f14f315e510e287e7ac2e4bdb1a","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/pull/42091","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/pull/42092","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/pull/42093","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/pull/42094","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-4fx9-5m29-83p4","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00324,"epssPercentile":0.25684,"ingestedAt":"2026-09-08T21:11:12.273Z","slug":"CVE-2026-72722","body":"## Overview\n\nDiscourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, TopicLink.extract_from, TopicLink.ensure_entry_for, and TopicLink.duplicate_lookup do not consistently enforce Guardian.can_see? checks when processing internal links. An authenticated user can submit links to restricted topics, private messages, or hidden posts and receive canonicalized slugs or titles in the composer_messages duplicate_lookup response even though the targets are not visible to that user. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}