A flaw was found in the login theme rendering component of Keycloak. The issue occurs because the security filter responsible for cleaning user input can be bypassed, allowing a realm administrator to store malicious scripts in display fields. This could result in unauthorized JavaScript execution in the browsers of users visiting the login page, potentially leading to data exposure or session interference.
Metrics
Affected Vendors & Products
References
History
Mon, 26 Oct 2026 01:00:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Redhat build Of Keycloak
Redhat single Sign-on |
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| Vendors & Products |
Redhat build Of Keycloak
Redhat single Sign-on |
Tue, 13 Oct 2026 18:30:00 +0000
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| Metrics |
ssvc
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Fri, 09 Oct 2026 12:15:00 +0000
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| References |
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| Metrics |
threat_severity
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threat_severity
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Fri, 09 Oct 2026 05:00:00 +0000
| Type | Values Removed | Values Added |
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| Description | A flaw was found in the login theme rendering component of Keycloak. The issue occurs because the security filter responsible for cleaning user input can be bypassed, allowing a realm administrator to store malicious scripts in display fields. This could result in unauthorized JavaScript execution in the browsers of users visiting the login page, potentially leading to data exposure or session interference. | |
| Title | Keycloak-services: keycloak-services: stored xss on login page via kcsanitize bypass | |
| First Time appeared |
Redhat
Redhat build Keycloak Redhat red Hat Single Sign On |
|
| Weaknesses | CWE-79 | |
| CPEs | cpe:/a:redhat:build_keycloak: cpe:/a:redhat:red_hat_single_sign_on:7 |
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| Vendors & Products |
Redhat
Redhat build Keycloak Redhat red Hat Single Sign On |
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| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published: 2026-10-09T04:28:55.081Z
Updated: 2026-10-13T16:46:42.565Z
Reserved: 2026-10-09T04:07:31.462Z
Link: CVE-2026-107889
Updated: 2026-10-13T16:46:38.566Z
Status : Awaiting Analysis
Published: 2026-10-09T05:16:44.583
Modified: 2026-10-13T17:17:18.353
Link: CVE-2026-107889