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Fencer Vulns
low 3.4

CVE-2023-0657 json

Keycloak: impersonation via logout token exchange

published 2024-04-17 2 y ago modified 2026-09-10 1 mo ago also GHSA-7fpj-9hr8-28vh , EUVD-2024-1142

cvss
3.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

A flaw was found in Keycloak. This issue occurs due to improperly enforcing token types when validating signatures locally. This could allow an authenticated attacker to exchange a logout token for an access token and possibly gain access to data outside of enforced permissions.

Patch / fix

  • maven org.keycloak:keycloak-services 22.0.10, 24.0.3
  • Red Hat Red Hat build of Keycloak 22 22-13, 22-16, 22.0.10-1

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-2023-0657 updated cvss 3.4

keycloak: impersonation via logout token exchange

  • Red Hat Single Sign-On 7 rh-sso7-keycloak rh-sso7-keycloak
    affected: no fix available “Fix deferred”
  • Red Hat build of Keycloak 22 rhbk/keycloak-rhel9 22-13, rhbk/keycloak-rhel9-operator 22-16, rhbk/keycloak-operator-bundle 22.0.10-1
    fixed: vendor fix RHSA-2024:1867
  • Red Hat build of Keycloak 22.0.10
    fixed: vendor fix RHSA-2024:1868

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
23 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.4 CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
GitHub 3.1 3.4 CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-services
<22.0.10
>=23.0.0, <24.0.3
22.0.10
24.0.3

Affected products

  • Red Hat Red Hat build of Keycloak 22
  • Red Hat Red Hat build of Keycloak 22.0.10
  • Red Hat Red Hat Single Sign-On 7

Classification

Weakness
  • CWE-273 Improper Check for Dropped Privileges
  • CWE-284 Improper Access Control
  • CWE-287 Improper Authentication
  • CWE-290 Authentication Bypass by Spoofing
  • CWE-347 Improper Verification of Cryptographic Signature

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.