Improper Verification of Cryptographic Signature Affecting org.keycloak:keycloak-services package, versions [,26.4.14)[26.6.0, 26.6.5)[26.7.0, 26.7.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGKEYCLOAK-18751986
- published13 Aug 2026
- disclosed5 Aug 2026
- creditPaul Bottinelli
Introduced: 5 Aug 2026
NewCVE-2026-16443 (opens in a new tab)How to fix?
Upgrade org.keycloak:keycloak-services to version 26.4.14, 26.6.5, 26.7.1 or higher.
Overview
org.keycloak:keycloak-services is an open source identity and access management solution for modern applications and services.
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature during identity provider metadata import. An attacker can forge a SAML response and gain unauthorized access to a user account by importing metadata that includes a signing certificate but omits the key use attribute, leaving signature validation disabled for the broker endpoint.
When the imported IdP metadata is processed, the signing certificate is stored, but the response signature is not checked, so a forged assertion can be accepted for a known external identifier. This affects SAML identity brokering in deployments that import attacker-supplied or maliciously modified IdP metadata.