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Stored Cross-Site Scripting (XSS) in Keycloak via groups dropdown

GHSA-755v-r4x4-qf7m

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.keycloak:keycloak-core 20.0.0), 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.

Summary A Stored XSS vulnerability was reported in the Keycloak Security mailing list, affecting all the versions of Keycloak, including the latest release (16.0.1). The vulnerability allows a privileged attacker to execute malicious scripts in the admin console, abusing of the groups' dropdown functionality. Impact Successful attacks of this vulnerability can result a privileged attacker to load a XSS script, and steal data from other users. The impact can be considered moderate to low, considering privileged credentials are required. References - Please refer to the Keycloak Security mailing list for more information.

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

    Published from ghsa record GHSA-755v-r4x4-qf7m

Agent brief

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# Patch Next advisory brief: GHSA-755v-r4x4-qf7m

Advisory: Stored Cross-Site Scripting (XSS) in Keycloak via groups dropdown
IDs: GHSA-755v-r4x4-qf7m
Record: https://patchnext.com/advisories/ghsa-755v-r4x4-qf7m (revision 1, source checked 26 Oct 2026, 15:53 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-core 20.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.keycloak:keycloak-core: affected < 20.0.0; fixed in 20.0.0

## Suggested inspection (read-only)
- Maven org.keycloak:keycloak-core: 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-core.
- 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-755v-r4x4-qf7m (GitHub-reviewed advisory GHSA-755v-r4x4-qf7m lists affected ranges: Maven org.keycloak:keycloak-core >=0 <20.0.0)

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