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Vulnerability record · CVE-2026-9086 · published 25 June 2026

CVE-2026-9086: Redhat build of keycloak cross-site scripting vulnerability

Redhat · Build Of Keycloak

A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.

7.3 CVSS 3.1 High EPSS 0.78% · top 45.8% CWE-79 · Cross-site scripting
7.3CVSS 3.1 base score
0.78%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
13References
15 Jul 2026Last modified by NVD

Description

A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:30049 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:30050 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:30083 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:30084 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-9086 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2480170 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:30049 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:30050 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:30083 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:30084 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-9086 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2480170 Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9086.json Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-9086), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.