Improper Validation of Syntactic Correctness of Input Affecting org.keycloak:keycloak-quarkus-server package, versions [,26.5.2)
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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- published16 Jan 2026
- disclosed15 Jan 2026
- creditAlexander Schwartz
Introduced: 15 Jan 2026
CVE-2026-0976 (opens in a new tab)How to fix?
Upgrade org.keycloak:keycloak-quarkus-server to version 26.5.2 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Syntactic Correctness of Input due to the improper validation of matrix parameters in URL paths in JAX-RS routing layer. An attacker can gain access to administrative or sensitive endpoints by crafting requests that mask path segments, potentially bypassing proxy-level path filtering.