medium6.9
CVE-2026-37980
Keycloak: Arbitrary code execution via Stored Cross-Site Scripting (XSS) in organization selection login page
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | org.keycloak:keycloak-services | <= 26.5.5 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Redhat | Build Of Keycloak | All versions |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://access.redhat.com/errata/RHSA-2026:19596
- https://access.redhat.com/security/cve/CVE-2026-37980
- https://bugzilla.redhat.com/show_bug.cgi?id=2455325
- https://github.com/advisories/GHSA-m32f-8vh9-2hh3
- https://nvd.nist.gov/vuln/detail/CVE-2026-37980
- https://github.com/keycloak/keycloak/issues/48049