{"id":"CVE-2026-72720","title":"Discourse is an open-source discussion platform","summary":"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 Vi…","severity":"medium","cvss":6.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","cwe":["CWE-79"],"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-2026-72720","references":[{"url":"https://github.com/discourse/discourse/commit/234ee88a5b9b53bf938c53351eab20130323485f","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/commit/4b639a52f47fb3d46093bece9df147e4e9517a11","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/commit/a5d3b112d598242c1d1803d5a77bf98d5fdabd75","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/commit/b25a074b165253e01fc4c8911b980fc68338ea16","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/pull/42244","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/pull/42245","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/pull/42246","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/pull/42247","label":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-3q6f-6gm9-m35v","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00299,"epssPercentile":0.22788,"ingestedAt":"2026-09-08T21:11:12.272Z","slug":"CVE-2026-72720","body":"## Overview\n\nDiscourse 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":35.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}