CVE-2026-107889: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Red Hat Red Hat Build of Keycloak
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.
CVSS v3.1
Score 5.5medium
Affected software
Red Hat
Red Hat Build of Keycloak
Red Hat
Red Hat Build of Keycloak
Red Hat
Red Hat Single Sign-On 7
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-10-09T04:07:31.462Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-107889","vendor":"Red Hat"}]
Threat ID: 6ac872422cdf04f656291612
Added to database: 10/09/2026, 04:49:06 UTC
Last updated: 10/09/2026, 04:49:06 UTC
Views: 1
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