CVE-2023-6544

mediumpriority · track · 0EPSS 0.011 · 65 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.07% (65th) EPSS

CVSS 5.4 · medium

Is it mine?

18 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-23

A flaw was found in the Keycloak package. This issue occurs due to a permissive regular expression hardcoded for filtering which allows hosts to register a dynamic client. A malicious user with enough information about the environment could jeopardize an environment with this specific Dynamic Client Registration and TrustedDomain configuration previously unauthorized.

cvss

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

5.4

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.4mediumAV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · secalert@redhat.com USexploitability 2.8 · impact 2.5

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · OSV

v3.15mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-625USCWE-625USCWE-625US

affected products (18)

Products and version ranges known to be affected.

Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat Single Sign On <7.6.8all versionscert_bundDE
Red Hat Single Sign On< 7.6.8cert_bundDE
Red Hat RHEL-8 based Middleware Containers< 7.6-46enisa_euvdEU
Red Hat Red Hat Single Sign-On 7.6 for RHEL 7< 0:18.0.13-1.redhat_00001.1.el7ssoenisa_euvdEU
Red Hat Red Hat Single Sign-On 7.6 for RHEL 8< 0:18.0.13-1.redhat_00001.1.el8ssoenisa_euvdEU
Red Hat Red Hat Single Sign-On 7.6 for RHEL 9< 0:18.0.13-1.redhat_00001.1.el9ssoenisa_euvdEU
Red Hat Red Hat build of Keycloak 22< 22-13enisa_euvdEU
Red Hat Red Hat build of Keycloak 22< 22-16enisa_euvdEU
Red Hat Red Hat build of Keycloak 22< 22.0.10-1enisa_euvdEU
Red Hat Inc. Red Hat Build of Keycloak≤ 22.0.10fstec_bduRU
Red Hat Inc. Red Hat Build of Keycloak≤ 22fstec_bduRU
Red Hat Inc. Red Hat Single Sign-On≤ 7.6.8fstec_bduRU
Red Hat Inc. Red Hat Single Sign-On≤ 7.6 for RHEL 9fstec_bduRU
Red Hat Inc. Red Hat Single Sign-On≤ 7.6 for RHEL 8fstec_bduRU
Red Hat Inc. Red Hat Single Sign-On≤ 7.6 for RHEL 7fstec_bduRU
Maven org.keycloak:keycloak-services< 22.0.10osvUSpkg:maven/org.keycloak/keycloak-services
Maven org.keycloak:keycloak-services23.0.0 → 24.0.3osvUSpkg:maven/org.keycloak/keycloak-services

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-0910Red Hat Single Sign On: Mehrere Schwachstellen ermöglichen Umgehen von SicherheitsvorkehrungenDeutsch2024-04-16csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Single Sign On ausnutzen, um Sicherheitsmaßnahmen zu umgehen, einen Denial-of-Service-Zustand auszulösen, DDoS-Angriffe durchzuführen, vertrauliche Informationen offenzulegen oder Dateien zu manipulieren.
WID-SEC-W-2024-0914Red Hat Enterprise Linux (keycloak): Mehrere SchwachstellenDeutsch2024-04-16csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, Cross-Site Scripting (XSS)-Angriffe durchzuführen oder einen Denial-of-Service-Zustand zu verursachen.
GHSA-46c8-635v-68r2Keycloak Authorization Bypass vulnerability2024-04-17ghsa · osvUS
Due to a permissive regular expression hardcoded for filtering allowed hosts to register a dynamic client, a malicious user with enough information about the environment could benefit and jeopardize an environment with this specific Dynamic Client Registration with TrustedDomain configuration previously unauthorized. #### Acknowledgements: Special thanks to Bastian Kanbach for reporting this issue and helping us improve our security.

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 osv NVD CVE.org MITRE

published 2024-04-25modified 2026-06-17

references (29)

External citations — patches, advisories, analysis.

scry

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