Medium [CVE-2026-37980] Org.keycloak.forms.login: keycloak: keycloak: arbitrary code execution via stored cross-site scripting (xss) in organization selection login page
This medium-severity Red Hat Linux advisory covers CVE-2026-37980 affecting Red Hat Build of Keycloak.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
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. This vulnerability has Moderate impact.
This payload executes in the context of a user's browser when the login page is viewed, potentially leading to session theft or further attacks. Red Hat severity: Moderate — CVSS 6.9 (CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N).
Weakness: CWE-79. Affected Red Hat products: Red Hat Build of Keycloak.
Red Hat does not currently list a fixing RHSA for this CVE.
Is CVE-2026-37980 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-37980 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-37980?
The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 18 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 18 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 18 days ago·verify at source
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