Medium severity · published May 19, 2026
CVE-2026-37978
Keycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admin api
4.9
CVSS
0.4%
EPSS
No
On KEV
Description
A flaw was found in Keycloak. A low-privilege administrator with the 'view-clients' role can exploit this by invoking the 'evaluate-scopes' Admin API endpoints with an arbitrary user ID (userId) parameter. This vulnerability allows for cross-role personally identifiable information (PII) leakage, enabling unauthorized visibility into user identities and authorizations across the realm. Exploitation is possible remotely via network access to the Admin API.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat build of Keycloak 26.4 · Red Hat
All versions, or not specified · source: vendor
BO
Build OF Keycloak · Redhat
before 26.4.12 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-37978
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-37978
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19596
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19597
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-37978
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2455327
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