Is CVE-2026-107623 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-107623?

CVE-2026-107623 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-107623

Description

A flaw was found in the OIDC Dynamic Client Registration (DCR) component of Keycloak. A bug in the response serialization causes the backchannel logout offline token revocation setting to be omitted from responses. When a client performs a standard update, this missing information causes the setting to be silently disabled. As a result, offline tokens may remain valid even after a user session is terminated via backchannel logout.