CVE-2026-1180

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{"analysis": {"en": {"generated_at": "2026-04-15T21:44:21.333664+00:00", "value": {"mitigation_remediation": ["Apply the Red\u202fHat errata RHSA\u20112026:6477 and RHSA\u20112026:6478 to update Keycloak 26.4 to the patched state.", "Upgrade older Keycloak deployments to at least version\u202f26.4.11, which includes the ssrf mitigation.", "Restrict the jwks_uri value in the OIDC configuration to trusted URLs only, preventing clients from supplying arbitrary service addresses."], "summary": {"action": "Patch immediately", "impact": "Server\u2011Side Request Forgery enabling internal network reconnaissance"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Red\u202fHat Build of Keycloak, particularly versions 26.4 and 26.4.11, as well as the Red\u202fHat build of Keycloak 26.4 prior to the update. It also impacts Red\u202fHat JBoss Enterprise Application Platform 8, the JBoss Enterprise Application Platform Expansion Pack, and Red\u202fHat Single Sign\u2011On\u202f7. No additional version restrictions are listed in the official CNA data.", "description_and_impact": "Keycloak\u2019s OpenID Connect Dynamic Client Registration uses private_key_jwt authentication and permits a client to provide an arbitrary jwks_uri. Keycloak blindly follows that URI and retrieves the JWK set, creating a blind server\u2011side request forgery that can reach internal or restricted endpoints. Attackers can therefore scan a corporate network or cloud metadata services for exposed services, producing information disclosure and reconnaissance data without directly engaging the victim systems.", "risk_and_exploitability": "With a CVSS score of 5.8, the issue falls into the medium severity range. The EPSS score of less than 1% suggests a low exploitation probability in the current landscape, and it is not present in the CISA KEV catalog. The likely attack vector is an attacker or compromised client that successfully registers with Keycloak using private_key_jwt, enabling it to supply an arbitrary jwks_uri. Because the flaw does not require authentication to the Keycloak server itself, the attacker could leverage legitimate client registration flows or hijacked clients to mitigate the internal\u2011network probing risk."}}}}, "created": "2026-04-15T21:45:14.153704+00:00", "updated": "2026-04-15T21:45:14.153721+00:00", "vendors": []}