CVE-2023-0264

mediumpriority · track · 30OT risk · elevatedEPSS 0.013 · 70 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

2 exploits · PoC

Likely / severe?

1.27% (70th) EPSS

CVSS 5 · medium

Is it mine?

16 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.7

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.7–8.7

v3.15mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:Lprimary · NVD / NIST USexploitability 1.6 · impact 3.4

v3.17.1highAV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.7highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:Nsecondary · OSV

v3.14.7mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USprimaryCWE-287USCWE-303USCWE-345US

exploits (2)

Public proof-of-concept and weaponised exploit code.

ElianGonzi00/pocKeycloakCVE-2023-0264ElianGonzi00/pocKeycloakCVE-2023-0264PoC · poc_in_github
twwd/CVE-2023-0264A small PoC for the Keycloak vulnerability CVE-2023-0264PoC · poc_in_github

affected products (16)

Products and version ranges known to be affected.

Hitachi Ops Center < Common Services 10.9.3-00all versionscert_bundDEcpe:/a:hitachi:ops_center:common_services_10.9.3-00
redhat.com KeyCloak18.0.6 → 18.0.6enisa_euvdEU
Red Hat Inc. Keycloak≤ 22.0.1fstec_bduRU
Red Hat Inc. Keycloak≤ 21.0.1fstec_bduRU
Red Hat Inc. Red Hat Single Sign-On≤ 7.6fstec_bduRU
Red Hat Inc. Red Hat Single Sign-On≤ 7fstec_bduRU
redhat keycloak< 18.0.6nvdUScpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*
redhat openshift container platform= 4.10nvdUScpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
redhat openshift container platform= 4.9nvdUScpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
redhat openshift container platform for ibm linuxone= 4.10nvdUScpe:2.3:a:redhat:openshift_container_platform_for_ibm_linuxone:*:*:*:*:*:*:*:*
redhat openshift container platform for ibm linuxone= 4.9nvdUScpe:2.3:a:redhat:openshift_container_platform_for_ibm_linuxone:*:*:*:*:*:*:*:*
redhat openshift container platform ibm z systems= 4.10nvdUScpe:2.3:a:redhat:openshift_container_platform_ibm_z_systems:*:*:*:*:*:*:*:*
redhat openshift container platform ibm z systems= 4.9nvdUScpe:2.3:a:redhat:openshift_container_platform_ibm_z_systems:*:*:*:*:*:*:*:*
redhat single sign-onall versionsnvdUScpe:2.3:a:redhat:single_sign-on:*:*:*:*:*:*:*:*
redhat single sign-on< 7.6.2nvdUScpe:2.3:a:redhat:single_sign-on:*:*:*:*:*:*:*:*
Maven org.keycloak:keycloak-services< 21.0.1osvUSpkg:maven/org.keycloak/keycloak-services

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-0562Keycloak: Mehrere SchwachstellenDeutsch2023-03-02csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um falsche Informationen darzustellen und Sicherheitsvorkehrungen zu umgehen.
GHSA-9g98-5mj6-f9mvKeycloak vulnerable to user impersonation via stolen UUID code2023-03-02ghsa · osvUS
Keycloak's OpenID Connect user authentication was found to incorrectly authenticate requests. An authenticated attacker who could also obtain a certain piece of info from a user request, from a victim within the same realm, could use that data to impersonate the victim and generate new session tokens.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd osv NVD CVE.org MITRE

published 2023-08-04modified 2026-07-29

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+7709 more

references (5)

External citations — patches, advisories, analysis.

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