ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2021-20323

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

Published Mar 25, 2022 · catalog updated Jun 17, 2026 · A POST based reflected

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2021-20323 is not in CISA KEV. FIRST estimates a 37.25% chance of exploitation in the next 30 days. Check whether you run A POST based reflected.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A POST based reflected).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
37.25%
Remediation
Version ranges on file
Affected products
cpe redhat/keycloak

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe redhat/keycloak< 17.0.0

How to fix CVE-2021-20323

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-20323 is not in CISA KEV. FIRST estimates a 37.25% chance of exploitation in the next 30 days. Check whether you run A POST based reflected.

Which versions are affected?

Compare what you have installed with < 17.0.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 37.25%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Keycloak security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 25, 2022 · Monitored products — high

    Detected

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

  2. Jun 17, 2026 · Monitored products — high

    Updated

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

Sources

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Monitored products — highNov 3, 2026