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Fencer Vulns
low 2.7

CVE-2026-3911 json

Org.keycloak.services.resources.admin.userresource: keycloak: information disclosure of disabled user attributes via administrative endpoint

published 2026-03-11 7 mo ago modified 2026-09-10 1 mo ago also BIT-keycloak-2026-3911 , EUVD-2026-11107 , GHSA-xh32-c9wx-phrp

cvss
2.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami keycloak 26.4.1, 26.5.0
  • Red Hat Red Hat build of Keycloak 26.4 26.4-14, 26.4.11-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-3911 updated cvss 2.7

org.keycloak.services.resources.admin.UserResource: Keycloak: Information disclosure of disabled user attributes via administrative endpoint

  • Red Hat build of Keycloak 26.4 rhbk/keycloak-rhel9 26.4-14, rhbk/keycloak-rhel9-operator 26.4-14, rhbk/keycloak-operator-bundle 26.4.11-1
    fixed: vendor fix RHSA-2026:6478
  • Red Hat build of Keycloak 26.4.11
    fixed: vendor fix RHSA-2026:6477

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 2.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
GitHub 3.1 2.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
OSV 3.1 2.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-services
<=26.5.5
 no fix listed
bitnami keycloak
>=26.4.0, <26.4.1
>=26.4.11, <26.5.0
26.4.1
26.5.0

Affected products

  • Red Hat Red Hat build of Keycloak 26.4
  • Red Hat Red Hat build of Keycloak 26.4.11

Classification

Weakness
  • CWE-359 Exposure of Private Personal Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.