Vulnerability Description
A flaw was found in the SAML protocol implementation of Keycloak, an open-source identity and access management solution. The issue occurs when Keycloak handles SAML authentication requests using the HTTP-Redirect binding. If a client is configured with a wildcard redirect URL, an attacker can craft a request that includes malicious parameters. When a user authenticates, Keycloak appends its legitimate response to the attacker's parameters. This can cause some service providers to process the attacker's data instead of the real login information, potentially leading to a user being logged into the wrong account.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Build Of Keycloak | - |
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2026-18217Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2508311Issue TrackingVendor Advisory
FAQ
What is CVE-2026-18217?
CVE-2026-18217 is a vulnerability with a CVSS score of 3.4 (LOW). A flaw was found in the SAML protocol implementation of Keycloak, an open-source identity and access management solution. The issue occurs when Keycloak handles SAML authentication requests using the ...
How severe is CVE-2026-18217?
CVE-2026-18217 has been rated LOW with a CVSS base score of 3.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-18217?
Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak.