CVE-2026-18217
Last modified
CVE-2026-18217 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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. EPSS estimates a 0.19% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Build Of Keycloak | All versions |
References
- https://access.redhat.com/security/cve/CVE-2026-18217Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2508311Issue Tracking, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-18217?
How severe is CVE-2026-18217?
How do I fix CVE-2026-18217?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-18208A flaw was found in the OIDC token introspection endpoint of…6.5
- CVE-2026-18209A flaw was found in the keycloak-services component of Keycl…4.7
- CVE-2026-1821The Microtango plugin for WordPress is vulnerable to Stored …6.4
- CVE-2026-18211A flaw was found in the secure-client-uris client policy exe…5.4
- CVE-2026-18214Keycloak allows users to log in using Google accounts and ca…8.1
- CVE-2026-18215Keycloak provides a way to let users log in using Microsoft …8.1
- CVE-2026-18218A flaw was found in the TokenManager component of the Keyclo…5.4
- CVE-2026-1822The WP NG Weather plugin for WordPress is vulnerable to Stor…6.4
- CVE-2026-18220An out-of-bounds write vulnerability was found in the BFD li…7.8
- CVE-2026-1823The Consensus Embed plugin for WordPress is vulnerable to St…6.4
- CVE-2026-18230The WP Directory Kit WordPress plugin before 1.5.6 does not …
- CVE-2026-18236A vulnerability in the Agent Development Kit (ADK) allows fo…9.3
Are you affected by CVE-2026-18217?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST