Authentication Bypass by Capture-replay in Keycloak - CVE-2026-37982

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU148950

Authentication Bypass by Capture-replay in Keycloak - CVE-2026-37982

Published: September 10, 2026


Vulnerability identifier: #VU148950
CSH Severity: Medium
CVSS v4: 7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-37982
CWE-ID: CWE-294
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to take over accounts.

The vulnerability exists due to authentication bypass by capture-replay in Keycloak\'s WebAuthn flow when processing an intercepted execute-actions email link. A remote attacker can replay an ExecuteActionsActionToken token and register an authenticator to a victim\'s account to take over accounts.

User interaction is required to access an execute-actions email link.


Affected software

Keycloak
Red Hat build of Keycloak

How to mitigate CVE-2026-37982

Install security update from vendor's website.

Keycloak - update to 26.6.2
Red Hat build of Keycloak - update to 26.4.12

External References

Related Security Bulletins