Bug 2507409 (CVE-2026-17526)

Summary: CVE-2026-17526 keycloak-services: keycloak-services: Privilege escalation via impersonation role allows takeover of realm administrator accounts
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: anujha, aschwart, asoldano, aszczucz, bbaranow, bmaxwell, boliveir, bstansbe, dlofthou, drichtar, istudens, ivassile, iweiss, mosmerov, mposolda, msvehla, nwallace, pberan, pesilva, pjindal, pmackay, rmartinc, rstancel, security-response-team, ssilvert, sthorger, thjenkin, vdosoudi, vmuzikar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Keycloak is an open-source identity and access management solution. A vulnerability was discovered where a user with the impersonation role can impersonate a realm administrator. This allows the attacker to gain full administrative control over the realm, including the ability to manage users, clients, and roles.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Embargoed:
Deadline: 2026-10-22   

Description OSIDB Bzimport 2026-07-27 08:40:14 UTC 
A flaw was found in Keycloak. A user holding only the impersonation realm-management client role can impersonate any enabled, non-service-account user in the realm, including full realm administrators. The impersonation endpoint restricts service accounts as targets but performs no privilege-level check on the target user. After impersonating an administrator, the attacker obtains a valid SSO session and can exchange it for a fully signed access token via a standard OIDC authorization-code flow, gaining complete administrative control over the realm (read/write all users, clients, roles, password resets). The impersonation role is designed as a lesser delegation for support staff, and this flaw defeats that separation.