CVE-2021-20293: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

June 15, 2021 (updated August 31, 2021)

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.

References

github.com/advisories/GHSA-5h26-c766-g93v
nvd.nist.gov/vuln/detail/CVE-2021-20293

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