Improper Verification of Cryptographic Signature in Keycloak - CVE-2026-16443
Published: August 6, 2026
Vulnerability identifier: #VU141170
CSH Severity: Medium
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-16443
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to a user account.
The vulnerability exists due to improper verification of cryptographic signature in the SAML metadata import functionality of the keycloak-services component when importing identity provider metadata that lacks specific usage attributes for keys. A remote attacker can forge a SAML response to gain unauthorized access to a user account.
Exploitation requires knowledge of the target user\'s external identifier.
Affected software
Keycloak
How to mitigate CVE-2026-16443
Install security update from vendor's website.
Keycloak - addressed in versions 26.4.14, 26.6.5, 26.7.1