CVE-2026-9794 Keycloak: keycloak: information disclosure via saml ecp endpoint
Remote attackers can identify client protocol types via SAML ECP endpoint responses, leading to information disclosure in Keycloak.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-9794?
CVE-2026-9794 is a medium-severity vulnerability in Redhat Build of Keycloak, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in Keycloak. A remote, unauthenticated attacker can exploit this vulnerability by sending specially crafted SOAP requests to the SAML ECP (Security Assertion Markup Language Enhanced Client or Proxy) endpoint with varying client IDs. By observing distinct faultstrings in the responses, the attacker can determine the client's protocol type, leading to information disclosure.
Weakness: CWE-209
Which versions are affected by CVE-2026-9794?
4 open source packages ship an affected version, including org.keycloak:keycloak-services. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-services Maven | All versions to 26.4.7 | None |
org.keycloak:keycloak-services Maven | All versions to 26.4.7 | None |
org.keycloak:keycloak-services Maven | From 26.5.0 | 26.6.3 |
org.keycloak:keycloak-services Maven | From 26.5.0 | 26.6.3 |
Products include Redhat Build of Keycloak.
How do I fix CVE-2026-9794?
Upgrade org.keycloak:keycloak-services to 26.6.3 or later.
Is CVE-2026-9794 being exploited?
There is no known exploitation of CVE-2026-9794 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Redhat Build of Keycloak
- CVE-2026-15572 Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
- CVE-2026-3047 Keycloak SAML Broken has Authentication Bypass by Primary Weakness
- CVE-2026-15573 Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
- CVE-2026-16102 Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers
- CVE-2026-1609 Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
Sources
Also known as ECHO-4a9e-3a8a-145e, GHSA-fqjh-8322-vgrv, MINI-5pqp-cfmc-8w23, MINI-wcjj-q2cp-pvw3.