{"id":"CVE-2026-72720","state":"PUBLISHED","title":"Discourse: HTML injection in PrettyText.format_for_email from cooked-attribute reparsing","description":"Discourse is an open-source discussion platform. Prior to 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1, Discourse has HTML injection in PrettyText.format_for_email because cooked attribute values are reparsed as markup. Crafted Vimeo iframe sources, secure-upload URLs or dimensions, and hashtag data-slug values can cause decoded attribute text to be reinterpreted as HTML. The vulnerable conversion also fails to strictly validate the Vimeo iframe host and path, allowing non-Vimeo allowlisted iframes to be converted. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1.","publishedAt":"2026-08-10T15:41:51.764Z","updatedAt":"2026-08-10T18:17:21.640Z","severity":{"score":6.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["discourse discourse"],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"version":"< 2026.1.7","status":"affected"},{"version":">= 2026.6.0-latest, < 2026.6.2","status":"affected"},{"version":">= 2026.7.0-latest, < 2026.7.1","status":"affected"},{"version":">= 2026.8.0-latest, < 2026.8.0-latest.1","status":"affected"}]}],"references":["https://github.com/discourse/discourse/security/advisories/GHSA-3q6f-6gm9-m35v","https://github.com/discourse/discourse/pull/42244","https://github.com/discourse/discourse/pull/42245","https://github.com/discourse/discourse/pull/42246","https://github.com/discourse/discourse/pull/42247","https://github.com/discourse/discourse/commit/234ee88a5b9b53bf938c53351eab20130323485f","https://github.com/discourse/discourse/commit/4b639a52f47fb3d46093bece9df147e4e9517a11","https://github.com/discourse/discourse/commit/a5d3b112d598242c1d1803d5a77bf98d5fdabd75","https://github.com/discourse/discourse/commit/b25a074b165253e01fc4c8911b980fc68338ea16"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72720.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72720","state":"PUBLISHED","datePublished":"2026-08-10T15:41:51.764Z","dateUpdated":"2026-08-10T18:17:21.640Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-10T13:48:09.545Z"},"containers":{"cna":{"title":"Discourse: HTML injection in PrettyText.format_for_email from cooked-attribute reparsing","descriptions":[{"lang":"en","value":"Discourse is an open-source discussion platform. Prior to 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1, Discourse has HTML injection in PrettyText.format_for_email because cooked attribute values are reparsed as markup. Crafted Vimeo iframe sources, secure-upload URLs or dimensions, and hashtag data-slug values can cause decoded attribute text to be reinterpreted as HTML. The vulnerable conversion also fails to strictly validate the Vimeo iframe host and path, allowing non-Vimeo allowlisted iframes to be converted. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1."}],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"version":"< 2026.1.7","status":"affected"},{"version":">= 2026.6.0-latest, < 2026.6.2","status":"affected"},{"version":">= 2026.7.0-latest, < 2026.7.1","status":"affected"},{"version":">= 2026.8.0-latest, < 2026.8.0-latest.1","status":"affected"}]}],"references":[{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-3q6f-6gm9-m35v","name":"https://github.com/discourse/discourse/security/advisories/GHSA-3q6f-6gm9-m35v","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/discourse/discourse/pull/42244","name":"https://github.com/discourse/discourse/pull/42244","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/pull/42245","name":"https://github.com/discourse/discourse/pull/42245","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/pull/42246","name":"https://github.com/discourse/discourse/pull/42246","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/pull/42247","name":"https://github.com/discourse/discourse/pull/42247","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/234ee88a5b9b53bf938c53351eab20130323485f","name":"https://github.com/discourse/discourse/commit/234ee88a5b9b53bf938c53351eab20130323485f","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/4b639a52f47fb3d46093bece9df147e4e9517a11","name":"https://github.com/discourse/discourse/commit/4b639a52f47fb3d46093bece9df147e4e9517a11","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/a5d3b112d598242c1d1803d5a77bf98d5fdabd75","name":"https://github.com/discourse/discourse/commit/a5d3b112d598242c1d1803d5a77bf98d5fdabd75","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/b25a074b165253e01fc4c8911b980fc68338ea16","name":"https://github.com/discourse/discourse/commit/b25a074b165253e01fc4c8911b980fc68338ea16","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-10T15:41:51.764Z"},"source":{"advisory":"GHSA-3q6f-6gm9-m35v","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-10T18:13:33.296372Z","id":"CVE-2026-72720","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-10T18:17:21.640Z"}}]}}}