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CVE-2021-20323

MediumPublished

A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak.

Published: Mar 25, 2022
Updated: Aug 3, 2024
Assigning CNA: redhat
Evidence observed: Aug 8, 2026

Primary CVSS

6.1/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

37.2%

Moderate · next 30 days

Percentile: 98.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak.

Sources

CVE-2021-20323Scanner
A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak.
CVE-2021-20323PoC
Proof-of-concept and analysis for CVE-2021-20323, a reflected XSS vulnerability in Keycloak's clients-registrations endpoint, with exploitation conditions, mitigation recommendations, and links to official advisories.
CVE-2021-20323Exploit
Exploitation Scanner Cross Site Scripting vulnerability in Keycloak.

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