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Reflected XSS on clients-registrations endpoint

GHSA-m98g-63qj-fp8j

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.keycloak:keycloak-parent 18.0.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-m98g-63qj-fp8j

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-m98g-63qj-fp8j

Advisory: Reflected XSS on clients-registrations endpoint
IDs: GHSA-m98g-63qj-fp8j
Record: https://patchnext.com/advisories/ghsa-m98g-63qj-fp8j (revision 1, source checked 26 Oct 2026, 15:52 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.keycloak:keycloak-parent 18.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.keycloak:keycloak-parent: affected >= 10.0.0, < 18.0.0; fixed in 18.0.0

## Suggested inspection (read-only)
- Maven org.keycloak:keycloak-parent: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.keycloak:keycloak-parent.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-m98g-63qj-fp8j (GitHub-reviewed advisory GHSA-m98g-63qj-fp8j lists affected ranges: Maven org.keycloak:keycloak-parent >=10.0.0 <18.0.0)

Commands are suggestions: review each one before running it.

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