Description
A flaw was found in Keycloak. An authenticated user with the view-users role could exploit a vulnerability in the UserResource component. By accessing a specific administrative endpoint, this user could improperly retrieve user attributes that were configured to be hidden. This unauthorized information disclosure could expose sensitive user data.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 | — | — |
| Red Hat | Red Hat build of Keycloak 26.4.11 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | keycloak-26.4-iamguarded-compat | No fix yet | — |
| Wolfi rolling | keycloak-26.5 +1 | 26.5.6-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.keycloak:keycloak-services | <= 26.5.5 | — | GHSA-xh32-c9wx-phrp |
Advisories 1
- WID-SEC-2026-0693 Keycloak: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Apr 6, 2026
References
- RHSA-2026:6477 vendor-advisory
- RHSA-2026:6478 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-3911 vdb-entry
- RHBZ#2446392 issue-tracking