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Fencer Vulns
medium 4.3

CVE-2026-37981 json

Keycloak: org.keycloak.authorization: keycloak: information disclosure via broken access control in user lookup endpoint

published 2026-05-19 5 mo ago modified 2026-10-26 14 d ago also BIT-keycloak-2026-37981 , EUVD-2026-30881 , GHSA-933f-rg6j-f46p

cvss
4.3
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. A broken access control vulnerability in the Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) resource, to enumerate and harvest personally identifiable information (PII) for all realm users. By sending crafted requests with arbitrary usernames or email values, the endpoint returns full profile objects for unrelated users. This leads to broad profile-level information disclosure.

Patch / fix

  • maven org.keycloak:keycloak-services 26.4.12, 26.6.2
  • bitnami keycloak 26.4.12
  • Red Hat Red Hat build of Keycloak 26.4 26.4-17, 26.4.12-1

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-2026-37981 updated cvss 4.3

keycloak: org.keycloak.authorization: Keycloak: Information disclosure via broken access control in user lookup endpoint

  • Red Hat build of Keycloak 26.4 rhbk/keycloak-rhel9 26.4-17, rhbk/keycloak-rhel9-operator 26.4-17, rhbk/keycloak-operator-bundle 26.4.12-1
    fixed: vendor fix RHSA-2026:19597
  • Red Hat build of Keycloak 26.4.12
    fixed: vendor fix RHSA-2026:19596

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
5 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 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
GitHub 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
OSV 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-services
<26.4.12
>=26.5.0, <26.6.2
26.4.12
26.6.2
bitnami keycloak
>=26.4.0, <26.4.12
26.4.12

Affected products

  • Red Hat Red Hat build of Keycloak 26.4
  • Red Hat Red Hat build of Keycloak 26.4.12

Classification

Weakness
  • CWE-1220 Insufficient Granularity of Access Control

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.