A flaw was found in the secure-client-uris client policy executor within Keycloak core services. This component is responsible for enforcing security requirements on client configurations, such as requiring encrypted connections for redirect URIs. Due to an improper check that only looks at the start of a web address rather than properly verifying the host, an attacker can bypass these security restrictions by using a specially crafted domain name. This could allow an attacker to intercept sensitive authentication codes over unencrypted connections.
Metrics
Affected Vendors & Products
References
History
Sun, 02 Aug 2026 19:45:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Redhat build Of Keycloak
Redhat data Grid Redhat jboss Enterprise Application Platform Expansion Pack Redhat single Sign-on |
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| Vendors & Products |
Redhat build Of Keycloak
Redhat data Grid Redhat jboss Enterprise Application Platform Expansion Pack Redhat single Sign-on |
Sat, 01 Aug 2026 00:15:00 +0000
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| References |
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| Metrics |
threat_severity
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threat_severity
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Fri, 31 Jul 2026 15:30:00 +0000
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| Metrics |
ssvc
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Fri, 31 Jul 2026 07:30:00 +0000
| Type | Values Removed | Values Added |
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| Description | A flaw was found in the secure-client-uris client policy executor within Keycloak core services. This component is responsible for enforcing security requirements on client configurations, such as requiring encrypted connections for redirect URIs. Due to an improper check that only looks at the start of a web address rather than properly verifying the host, an attacker can bypass these security restrictions by using a specially crafted domain name. This could allow an attacker to intercept sensitive authentication codes over unencrypted connections. | |
| Title | Keycloak-services: keycloak-services: secure-client-uris policy bypass via localhost-prefixed domains | |
| First Time appeared |
Redhat
Redhat build Keycloak Redhat jboss Data Grid Redhat jbosseapxp Redhat red Hat Single Sign On |
|
| Weaknesses | CWE-20 | |
| CPEs | cpe:/a:redhat:build_keycloak: cpe:/a:redhat:jboss_data_grid:8 cpe:/a:redhat:jbosseapxp cpe:/a:redhat:red_hat_single_sign_on:7 |
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| Vendors & Products |
Redhat
Redhat build Keycloak Redhat jboss Data Grid Redhat jbosseapxp Redhat red Hat Single Sign On |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published: 2026-07-31T07:08:24.767Z
Updated: 2026-07-31T14:56:13.354Z
Reserved: 2026-07-29T08:24:18.687Z
Link: CVE-2026-18211
Updated: 2026-07-31T14:56:09.086Z
Status : Analyzed
Published: 2026-07-31T08:16:27.610
Modified: 2026-08-07T14:30:12.280
Link: CVE-2026-18211