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CVE-2023-0264 Keycloak

Affected softwareKeycloak
Severity5.0 Medium CVSS 3.1
Fixed in21.0.1
WeaknessImproper authentication (CWE-287)
Published4 Aug 2023
Updated17 Jun 2026

Description

A flaw was found in Keycloaks OpenID Connect user authentication, which may incorrectly authenticate requests. An authenticated attacker who could obtain information from a user request within the same realm could use that data to impersonate the victim and generate new session tokens. This issue could impact confidentiality, integrity, and availability.

CWE-345

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC 1 indexed Published artifacts you can open, in GitHub PoC; first seen 2023-03-06.
  • EPSS 1.3% chance in 30 days
IndexArtifactStarsFirst seen
GitHub PoC A small PoC for the Keycloak vulnerability CVE-2023-0264 7 2023-03-06

Waratek protection

Mitigation candidate

A kind of vulnerability Waratek's rules address, with exploit code published or exploitation reported. No rule exists and none is planned yet. The decision below says what we found to build a rule from.

  • Protection none
  • Action unverified
  • Review automated Inferred
  • Record active
Decided by A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug
Finding A reference points at an upstream fix (redhat-cve tier): https://access.redhat.com/security/cve/CVE-2023-0264. That makes this CVE a candidate for an ARMR patch rule — it is the kind of defect ARMR can address, and there is a fix to work from. No rule exists and none is scheduled: writing one means reading the linked change and finding a hook point ARMR can express it at, which may turn out not to exist.
Candidate fix https://access.redhat.com/security/cve/CVE-2023-0264 : a Red Hat CVE page: the weakest kind, naming no commit, though it shows Red Hat has looked at the CVE

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.keycloak:keycloak-services 0 21.0.1 unbounded

Products and versions

6 products, 10 version entries
SourceVendorProductSchemeAffected versions
osv org.keycloak keycloak-services generic < 21.0.1
nvd redhat keycloak generic < 18.0.6
nvd redhat openshift container platform generic 4.9 · 4.10
nvd redhat openshift container platform for ibm linuxone generic 4.9 · 4.10
nvd redhat openshift container platform ibm z systems generic 4.9 · 4.10
nvd redhat single sign-on generic any version · < 7.6.2

References

URLTags
https://access.redhat.com/security/cve/CVE-2023-0264 redhat-cve
https://github.com/keycloak/keycloak/security/advisories/GHSA-9g98-5mj6-f9mv WEB
https://github.com/keycloak/keycloak/commit/ec8109112e67208c13e13f6d1f8706a5a3ba8d4c WEB
https://github.com/keycloak/keycloak PACKAGE

Timeline

Published2023-08-04By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.