CVE-2023-6544
Keycloak: authorization bypass
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Keycloak: authorization bypass
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.
- Record
CVE-2023-6544- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-625
- Updated
- 2026-11-02
EUVDEUVD-2024-1087
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.
- Record
EUVD-2024-1087- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-46c8-635v-68r2
Keycloak Authorization Bypass vulnerability
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.
- Record
GHSA-46c8-635v-68r2- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-625
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2023-6544- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-625
- Updated
- 2026-11-02
OSV
Keycloak: authorization bypass
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.
- Record
CVE-2023-6544- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-625
- Updated
- 2026-11-02
OSVGHSA-46c8-635v-68r2
Keycloak Authorization Bypass vulnerability
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.
- Record
GHSA-46c8-635v-68r2- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-625
- Updated
- 2026-11-02
OSVRHSA-2024:1860
Red Hat Security Advisory: Red Hat Single Sign-On 7.6.8 enhancement and security update on RHEL 7
- Record
RHSA-2024:1860- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
OSVRHSA-2024:1861
Red Hat Security Advisory: Red Hat Single Sign-On 7.6.8 security update on RHEL 8
- Record
RHSA-2024:1861- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
OSVRHSA-2024:1862
Red Hat Security Advisory: Red Hat Single Sign-On 7.6.8 security update on RHEL 9
- Record
RHSA-2024:1862- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.keycloak:keycloak-servicesMaven |
before 22.0.10 | 22.0.10 |
org.keycloak:keycloak-servicesMaven |
23.0.0 up to 24.0.3 | 24.0.3 |
org.keycloak:keycloak-servicesMaven |
before 22.0.10, plus listed versions 1.0-alpha-11.0-alpha-1-120620131.0-alpha-21.0-alpha-31.0-alpha-4 Show 45 moreShow less1.0-beta-11.0-beta-1-201505211.0-beta-1-201505231.0-beta-21.0-beta-31.0-beta-41.0-final1.0-rc-11.0-rc-21.0.1.Final1.0.2.Final1.0.3.Final1.0.4.Final1.0.5.Final1.1.0.Beta11.1.0.Beta21.1.0.Final1.1.1.Final1.2.0.Beta11.2.0.CR11.2.0.Final1.3.0.Final1.3.1.Final1.4.0.Final1.5.0-Final1.5.0.Final1.5.1.Final1.6.0.Final1.6.1.Final1.7.0.CR11.7.0.Final1.8.0.Alpha11.8.0.CR11.8.0.CR21.8.0.CR31.8.0.Final1.8.1.Final1.9.0.CR11.9.0.Final1.9.1.Final1.9.2.Final1.9.3.Final1.9.4.Final1.9.5.Final1.9.7.Final |
22.0.10 |
org.keycloak:keycloak-servicesMaven |
23.0.0 up to 24.0.3, plus listed versions 23.0.123.0.223.0.323.0.423.0.5 Show 5 moreShow less23.0.623.0.724.0.024.0.124.0.2 |
24.0.3 |
rh-sso7-keycloakRed Hat:red_hat_single_sign_on:7.6::el7 From an advisory covering 5 CVEs |
before 0:18.0.13-1.redhat_00001.1.el7sso | 0:18.0.13-1.redhat_00001.1.el7sso |
rh-sso7-keycloak-serverRed Hat:red_hat_single_sign_on:7.6::el7 From an advisory covering 5 CVEs |
before 0:18.0.13-1.redhat_00001.1.el7sso | 0:18.0.13-1.redhat_00001.1.el7sso |
rh-sso7-keycloakRed Hat:red_hat_single_sign_on:7.6::el8 From an advisory covering 5 CVEs |
before 0:18.0.13-1.redhat_00001.1.el8sso | 0:18.0.13-1.redhat_00001.1.el8sso |
rh-sso7-keycloak-serverRed Hat:red_hat_single_sign_on:7.6::el8 From an advisory covering 5 CVEs |
before 0:18.0.13-1.redhat_00001.1.el8sso | 0:18.0.13-1.redhat_00001.1.el8sso |
rh-sso7-keycloakRed Hat:red_hat_single_sign_on:7.6::el9 From an advisory covering 5 CVEs |
before 0:18.0.13-1.redhat_00001.1.el9sso | 0:18.0.13-1.redhat_00001.1.el9sso |
rh-sso7-keycloak-serverRed Hat:red_hat_single_sign_on:7.6::el9 From an advisory covering 5 CVEs |
before 0:18.0.13-1.redhat_00001.1.el9sso | 0:18.0.13-1.redhat_00001.1.el9sso |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-6544 is a medium vulnerability (CVSS 5.4) in Red Hat Build Of Keycloak 22, published April 17, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.07%, the 65th percentile. Fixed in org.keycloak:keycloak-services 22.0.10.
References
access.redhat.com/errata/RHSA-2024:1860
Show 32 moreShow less
bugzilla.redhat.com/show_bug.cgi?id=2253116
github.com/keycloak/keycloak/security/advisories/GHSA-46c8-635v-68r2
nvd.nist.gov/vuln/detail/CVE-2023-6544
catalog.redhat.com/software/containers
security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_1860.json
cve.org/CVERecord?id=CVE-2023-6484
Left out here: 110 versions. The JSON record has them.