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Medium

Reflected XSS on clients-registrations endpoint

  • Disclosed: 28.04.2022
  • Updated: 11.10.2026 12:21

A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak. When a malicious request is sent to the client registration endpoint, the error message is not properly escaped, allowing an attacker to execute malicious scripts into the user's browser.

Acknowledgement

Keycloak would like to thank Quentin TEXIER (Pentester at Opencyber) for reporting this issue.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) org.keycloak:keycloak-parent >= 10.0.0, < 18.0.0 18.0.0

References

CVSS score -
Weakness (CWE)
CWE-79
Platform
Java / Kotlin (Maven)
Package
org.keycloak:keycloak-parent
Disclosed
28.04.2022
Updated
11.10.2026 12:21

Sources and licenses

OSV / GitHub Advisory Database - GHSA-m98g-63qj-fp8j - CC BY 4.0

Vulnerability history: org.keycloak:keycloak-parent

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (26) in the archive
Total entries
26
First → latest
05.2021 02.2026
Without a fix
6
Exploited in attacks
0

Severity breakdown

  • Critical 2
  • High 12
  • Medium 10
  • Low 2

Disclosures per year

Severity:
  1. Keycloak Cross-site Scripting on OpenID connect login service
    High · 8.1 CVE-2022-4137 < 20.0.5 20.0.5
  2. Keycloak vulnerable to path traversal via double URL encoding
    Critical · 9.1 CVE-2022-3782 < 20.0.2 20.0.2
  3. Keycloak SAML javascript protocol mapper: Uploading of scripts through admin console
    High · 7.2 CVE-2022-2668 < 19.0.2 19.0.2
  4. Incorrect implementation of lockout feature in Keycloak
    High · 7.5 CVE-2021-3513 < 13.0.0 13.0.0
  5. Visualizer: Tables and Charts Manager for WordPress <= 3.7.9 - Authenticated (Contributor+) PHAR Deserialization
    High · 8.8 CVE-2022-2256 < 19.0.2 19.0.2
  6. Keycloak Authentication Error
    Critical · 9.8 CVE-2019-14910 >= 7.0.0, <= 7.0.1 no fix
  7. Keycloak Authentication Error
    High · 8.3 CVE-2019-14909 >= 7.0.0, <= 7.0.1 no fix
  8. Keycloak CSRF Vulnerability
    High · 7.5 CVE-2017-12159 < 3.4.0 3.4.0
  9. Keycloak Oauth Implementation Error
    High · 7.2 CVE-2017-12160 < 3.3.0.Final 3.3.0.Final
  10. Keycloak Improper Bruteforce Detection
    High · 8.1 CVE-2018-14657 < 4.6.0.Final 4.6.0.Final
  11. Reflected XSS on clients-registrations endpoint this entry
    Medium ghsa-m98g-63qj-fp8j >= 10.0.0, < 18.0.0 18.0.0
  12. Keycloak insufficient session expiration
    High · 7.1 CVE-2021-3461 < 14.0.0 14.0.0
  13. Path Traversal
    High · 7.5 CVE-2020-14366 < 12.0.0 12.0.0
  14. Allocation of Resources Without Limits or Throttling in Keycloak
    High · 7.5 CVE-2020-10758 < 11.0.1 11.0.1
  15. Code injection in keycloak
    High · 8.3 CVE-2021-20222 >= 9.0.0, < 12.0.3 12.0.3

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