{"id":"CVE-2021-20293","aliases":["GHSA-5h26-c766-g93v"],"url":"https://o3.security/vulnerability/CVE-2021-20293","summary":"Cross-Site Scripting","details":"A reflected Cross-Site Scripting (XSS) flaw was found in RESTEasy in all versions of RESTEasy up to 4.6.0.Final, where it did not properly handle URL encoding when calling @javax.ws.rs.PathParam without any @Produces MediaType. This flaw allows an attacker to launch a reflected XSS attack. The highest threat from this vulnerability is to data confidentiality and integrity.","published":"2021-06-10T12:15:07.947Z","modified":"2026-07-08T21:25:35.762631Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.00856,"percentile":0.55224,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.jboss.resteasy:resteasy-bom","fixedVersion":null},{"ecosystem":"Maven","name":"org.jboss.resteasy:resteasy-core","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210727-0005/"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1942819"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T21:25:35.762631Z"}}