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Critical, CVSS 10.0

Keycloak vulnerable to cross-site scripting when validating URI-schemes on SAML and OIDC

CVE-2022-4361GHSA-3p62-6fjh-3p5h

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.keycloak:keycloak-services 21.1.2), 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
10.0 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
  • CVE-2022-4361: 0.69% estimated exploitation activity in the next 30 days; percentile 52.89 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

AssertionConsumerServiceURL is a Java implementation for SAML Service Providers (org.keycloak.protocol.saml). Affected versions of this package are vulnerable to Cross-site Scripting (XSS). AssertionConsumerServiceURL allows XSS when sending a crafted SAML XML request.

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

    Published from ghsa record GHSA-3p62-6fjh-3p5h

Agent brief

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# Patch Next advisory brief: CVE-2022-4361

Advisory: Keycloak vulnerable to cross-site scripting when validating URI-schemes on SAML and OIDC
IDs: CVE-2022-4361, GHSA-3p62-6fjh-3p5h
Record: https://patchnext.com/advisories/cve-2022-4361 (revision 1, source checked 26 Oct 2026, 16:16 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 10.0)
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-services 21.1.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.keycloak:keycloak-services: affected < 21.1.2; fixed in 21.1.2

## Suggested inspection (read-only)
- Maven org.keycloak:keycloak-services: 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-services.
- 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-3p62-6fjh-3p5h (GitHub-reviewed advisory GHSA-3p62-6fjh-3p5h lists affected ranges: Maven org.keycloak:keycloak-services >=0 <21.1.2)

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