Improper Verification of Cryptographic Signature Affecting org.keycloak:keycloak-core package, versions [,26.6.4)
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-17660979
- published28 Jun 2026
- disclosed29 May 2026
- creditBilal Teke
Introduced: 29 May 2026
CVE-2026-11800 (opens in a new tab)How to fix?
Upgrade org.keycloak:keycloak-core to version 26.6.4 or higher.
Overview
org.keycloak:keycloak-core is an open source identity and access management solution.
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JWT Authorization Grant flow due to algorithm confusion in signature verification. An attacker can gain unauthorized access and potentially escalate privileges by forging assertions and creating unauthorized access tokens.