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Fencer Vulns
high 7.4

CVE-2026-4282 json

Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseobjectprovider isolation flaw

published 2026-04-02 7 mo ago modified 2026-10-26 13 d ago also BIT-keycloak-2026-4282 , EUVD-2026-18208 , GHSA-hj93-h7pg-fh6v

cvss
7.4
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 37%
public exploits
0
none known

Summary

A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an unauthenticated attacker to forge authorization codes. Successful exploitation can lead to the creation of admin-capable access tokens, resulting in privilege escalation.

Patch / fix

  • maven org.keycloak:keycloak-services 26.5.7
  • bitnami keycloak 26.2.1, 26.3.0, 26.4.1, 26.5.0
  • Red Hat Red Hat build of Keycloak 26.2 26.2-18, 26.2.15-1
  • 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-2026-4282 updated cvss 7.4

keycloak: Keycloak: Privilege escalation via forged authorization codes due to SingleUseObjectProvider isolation flaw

  • Red Hat build of Keycloak 26.2 rhbk/keycloak-rhel9 26.2-18, rhbk/keycloak-rhel9-operator 26.2-18, rhbk/keycloak-operator-bundle 26.2.15-1
    fixed: vendor fix RHSA-2026:6476
  • Red Hat build of Keycloak 26.2.15
    fixed: vendor fix RHSA-2026:6475
  • 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
total
Assessed
7 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADP 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
OSV 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-services
<26.5.7
26.5.7
bitnami keycloak
>=26.2.0, <26.2.1
>=26.2.15, <26.3.0
>=26.4.0, <26.4.1
>=26.4.11, <26.5.0
26.2.1
26.3.0
26.4.1
26.5.0

Affected products

  • Red Hat Red Hat build of Keycloak 26.2
  • Red Hat Red Hat build of Keycloak 26.2.15
  • Red Hat Red Hat build of Keycloak 26.4
  • Red Hat Red Hat build of Keycloak 26.4.11

Classification

Weakness
  • CWE-653 Improper Isolation or Compartmentalization

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.