{"id":"BIT-discourse-2026-72728","summary":"Discourse: Onebox iframe origin allowlist enforces URL authority boundary","details":"Discourse is an open-source discussion platform. Prior to 2026.1.7, an authenticated user could submit specially formed URLs that bypassed the Onebox allowlist and embedded malicious content in a site. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0.","aliases":["CVE-2026-72728","GHSA-qp9j-3v7r-wrvr"],"modified":"2026-08-17T08:10:32.297978705Z","published":"2026-08-17T05:44:33.304Z","database_specific":{"cpes":["cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*"],"severity":"Medium"},"references":[{"type":"WEB","url":"https://github.com/discourse/discourse/commit/92eec47e8b477cb8b4ccdb237e26dc1ba8f8b76b"},{"type":"WEB","url":"https://github.com/discourse/discourse/security/advisories/GHSA-qp9j-3v7r-wrvr"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72728"}],"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-2026-72728.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"}]}],"schema_version":"1.9.0"}