{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72724","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-08-10T13:48:09.545Z","datePublished":"2026-08-10T15:59:53.965Z","dateUpdated":"2026-08-11T01:57:42.639Z"},"containers":{"cna":{"title":"Discourse: Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismatch","problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48","tags":["x_refsource_CONFIRM"],"url":"https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48"},{"name":"https://github.com/discourse/discourse/pull/42091","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/pull/42091"},{"name":"https://github.com/discourse/discourse/pull/42092","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/pull/42092"},{"name":"https://github.com/discourse/discourse/pull/42093","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/pull/42093"},{"name":"https://github.com/discourse/discourse/pull/42094","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/pull/42094"},{"name":"https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75"},{"name":"https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c"},{"name":"https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f"},{"name":"https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce"}],"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"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-10T15:59:53.965Z"},"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, plugins/chat/lib/chat/onebox_handler.rb resolves Chat::Thread by route thread_id independently of the route channel_id before checking whether the user can preview the selected chat channel. An authenticated user can pair a public channel ID with a private thread ID in a /onebox.json request and obtain private thread message content. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0."}],"source":{"advisory":"GHSA-8g98-fvfc-9w48","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-11T01:57:32.913192Z","id":"CVE-2026-72724","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-11T01:57:42.639Z"}}]}}