Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS
CVE-2026-97847 Overview
A flaw was found in the protocol mapper and identity resolution components of Keycloak. The issue occurs when a client manager uses hardcoded-claim mappers to override identity claims in sessionless service-account tokens. Because these tokens lack a session ID, Keycloak may incorrectly resolve the token bearer as a different, highly privileged user based on the manipulated claims. This can allow an attacker with limited client management permissions to impersonate a realm administrator and gain full control over the realm.
Critical Impact
Affected Products
- protocol mapper and identity resolution components of Keycloak: see the vendor advisory for the exact affected versions
Discovery Timeline
- 2026-11-05: CVE-2026-97847 published to the National Vulnerability Database by secalert@redhat.com
- 2026-11-05: last updated in the NVD database
Technical Details for CVE-2026-97847
Vulnerability Analysis
CVE-2026-97847 is a Improper Authentication weakness (CWE-287: Improper Authentication) in protocol mapper and identity resolution components of Keycloak. Based on its CVSS vector, the flaw can be reached over the network, needs some level of access, and needs no user interaction. The software does not properly prove who a user is.
With a CVSS base score of 7.1, apply the vendor fix and confirm exposure on internet facing and business critical assets first.
Root Cause
The weakness is classified as CWE-287: Improper Authentication. The software does not properly prove who a user is.
Attack Vector
Based on the CVSS vector, the flaw can be reached over the network, needs some level of access, and needs no user interaction. Attack complexity is high complexity.
No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
Detection Methods for CVE-2026-97847
Detection Strategies
- Inventory every instance of protocol mapper and identity resolution components of Keycloak and compare the running version with the affected range above.
- Check external attack surface scans for internet facing instances of the component.
- Run an authenticated vulnerability scan once your scanner ships a check for this CVE.
Monitoring Recommendations
- Forward protocol mapper and identity resolution components of Keycloak application, access and audit logs to your SIEM for retrospective hunting.
- Alert on new processes, configuration changes or outbound connections from the affected service.
- Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.
How to Mitigate CVE-2026-97847
Immediate Actions Required
- Apply the fixed version of protocol mapper and identity resolution components of Keycloak named in the vendor advisory.
- Prioritize internet facing and business critical instances first.
- Rescan after the change to confirm the exposure is closed.
Patch Information
Use the fixed version listed in the vendor advisory for protocol mapper and identity resolution components of Keycloak.
Workarounds
- If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.
CWE References
- CWE-287: Improper Authentication More CVEs with this weakness
Technical References
This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.
Frequently asked questions
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