Org.keycloak.forms.login: keycloak: keycloak: arbitrary code execution via stored cross-site scripting (xss) in organization selection login page
Summary
| CVE | CVE-2026-37980 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-14 15:16:34 UTC |
| Updated | 2026-04-17 15:11:03 UTC |
| Description | A flaw was found in Keycloak, specifically in the organization selection login page. A remote attacker with `manage-realm` or `manage-organizations` administrative privileges can exploit a Stored Cross-Site Scripting (XSS) vulnerability. This flaw occurs because the `organization.alias` is placed into an inline JavaScript `onclick` handler, allowing a crafted JavaScript payload to execute in a user's browser when they view the login page. Successful exploitation enables arbitrary JavaScript execution, potentially leading to session theft, unauthorized account actions, or further attacks against users of the affected realm. |
Risk And Classification
Primary CVSS: v3.1 6.9 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N
EPSS: 0.000550000 probability, percentile 0.171180000 (date 2026-04-21)
Problem Types: CWE-79 | CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 6.9 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N |
| 3.1 | CNA | CVSS | 6.9 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Build Of Keycloak | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-37980 | [email protected] | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-04-06T07:51:18.531Z | Reported to Red Hat. |
| CNA | 2026-04-06T12:34:00.000Z | Made public. |
Workarounds
CNA: Restrict access to the Keycloak administration console and login pages to trusted networks only, ideally through a VPN or by configuring firewall rules. Furthermore, ensure that only highly trusted administrators are granted `manage-realm` or `manage-organizations` privileges within Keycloak. Regularly review and audit administrative accounts and their assigned roles to minimize the risk of unauthorized access and exploitation. If the Keycloak service is restarted or reloaded, these network and access restrictions will persist.