CVE-2026-97848

Keycloak-services: keycloak-services: protocol mapper with jsontype=json bypasses token sanitization

CVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-97848

Published

A flaw was found in the token sanitization logic of Keycloak, an open source identity and access management solution. The issue occurs when a protocol mapper is configured to emit structured claims using the JSON type. The security check designed to remove unauthorized role mappings only looks for standard Java maps and fails to recognize Jackson based JSON objects. This allows an attacker to inject forged client roles into security tokens, which could lead to unauthorized access to protected resources.

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Affected versions, risk and source history

Exploitation and risk

Source status

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Advisory history

4 saved versions

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10 Nov 2026 00:02:10 UTC