Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS
CVE-2026-92857 Overview
Keycloak provides a Dynamic Client Registration feature that allows users with specific tokens to register their own applications. A flaw in how Keycloak validates these registration requests allows an attacker to create a malicious application that forges identity information. By mapping their own user profile details to protected fields like the user ID (sub) or intended audience (aud), an attacker can generate signed security tokens that make them appear to be a different user. This could allow an attacker to impersonate other users or gain unauthorized access to services that rely on these tokens for identity verification.
Critical Impact
Affected Products
- Unnamed software: see the vendor advisory for the exact affected versions
Discovery Timeline
- 2026-11-05: CVE-2026-92857 published to the National Vulnerability Database by secalert@redhat.com
- 2026-11-05: last updated in the NVD database
Technical Details for CVE-2026-92857
Vulnerability Analysis
CVE-2026-92857 is a Improper Input Validation weakness (CWE-20: Improper Input Validation) in Unnamed software. 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 trusts input without checking it is safe.
With a CVSS base score of 8.1, apply the vendor fix and confirm exposure on internet facing and business critical assets first.
Root Cause
The weakness is classified as CWE-20: Improper Input Validation. The software trusts input without checking it is safe.
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 low 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:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Detection Methods for CVE-2026-92857
Detection Strategies
- Inventory every instance of Unnamed software 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 Unnamed software 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-2026-92857
Immediate Actions Required
- Apply the fixed version of Unnamed software 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 Unnamed software.
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-20: Improper Input Validation 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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