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CVE-2026-107889 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://access.redhat.com/errata/RHSA-2026:95761	[email protected]
https://access.redhat.com/errata/RHSA-2026:95762	[email protected]
https://access.redhat.com/security/cve/CVE-2026-107889	[email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2548355	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

4 change records found show changes

Date	Action	Recorded By
Nov 6, 2026	CVE Modified	[email protected]
Nov 6, 2026	CVE Modified	[email protected]
Oct 13, 2026	CVE Modified	CISA-ADP
Oct 9, 2026	New CVE Received	[email protected]