{"id":"BIT-discourse-2026-72720","summary":"Discourse: HTML injection in PrettyText.format_for_email from cooked-attribute reparsing","details":"Discourse is an open-source discussion platform. Prior to 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0, 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.","aliases":["CVE-2026-72720","GHSA-3q6f-6gm9-m35v"],"modified":"2026-08-17T08:10:29.555933473Z","published":"2026-08-17T05:44:18.972Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"https://github.com/discourse/discourse/commit/234ee88a5b9b53bf938c53351eab20130323485f"},{"type":"WEB","url":"https://github.com/discourse/discourse/commit/4b639a52f47fb3d46093bece9df147e4e9517a11"},{"type":"WEB","url":"https://github.com/discourse/discourse/commit/a5d3b112d598242c1d1803d5a77bf98d5fdabd75"},{"type":"WEB","url":"https://github.com/discourse/discourse/commit/b25a074b165253e01fc4c8911b980fc68338ea16"},{"type":"WEB","url":"https://github.com/discourse/discourse/pull/42244"},{"type":"WEB","url":"https://github.com/discourse/discourse/pull/42245"},{"type":"WEB","url":"https://github.com/discourse/discourse/pull/42246"},{"type":"WEB","url":"https://github.com/discourse/discourse/pull/42247"},{"type":"WEB","url":"https://github.com/discourse/discourse/security/advisories/GHSA-3q6f-6gm9-m35v"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72720"}],"affected":[{"package":{"name":"discourse","ecosystem":"Bitnami","purl":"pkg:bitnami/discourse"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2026.1.7"},{"introduced":"2026.6.0"},{"fixed":"2026.6.2"},{"introduced":"2026.7.0"},{"fixed":"2026.7.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/discourse/BIT-discourse-2026-72720.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"}]}],"schema_version":"1.9.0"}