{"id":"BIT-discourse-2025-48954","summary":"Discourse vulnerable to XSS via user-provided query parameter in oauth failure flow","details":"Discourse is an open-source discussion platform. Versions prior to 3.5.0 are vulnerable to cross-site scripting when the content security policy isn't enabled when using social logins. Version 3.5.0 patches the issue. As a workaround, have the content security policy enabled.","aliases":["CVE-2025-48954","GHSA-26p5-mjjh-wfcf"],"modified":"2026-09-10T16:00:32.907718363Z","published":"2025-07-01T17:44:46.702Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://github.com/discourse/discourse/security/advisories/GHSA-26p5-mjjh-wfcf"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48954"}],"affected":[{"package":{"name":"discourse","ecosystem":"Bitnami","purl":"pkg:bitnami/discourse"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.5.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/discourse/BIT-discourse-2025-48954.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"}]}],"schema_version":"1.9.0"}