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Vulnerability record · CVE-2021-20293 · published 10 June 2021

CVE-2021-20293: Redhat resteasy cross-site scripting vulnerability

Redhat · Resteasy

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.

6.1 CVSS 3.1 Medium EPSS 0.86% · top 43.3% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1942819 Issue TrackingVendor Advisory
https://security.netapp.com/advisory/ntap-20210727-0005/ Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1942819 Issue TrackingVendor Advisory
https://security.netapp.com/advisory/ntap-20210727-0005/ Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-20293), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.