Information disclosure in Red Hat Build Of Keycloak
CVE-2026-9794
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.002
Affected products
- Red Hat Build Of Keycloak
- Red Hat Build Of Keycloak 26.4 — versions 26.4.13-1, 26.4-19
- Red Hat Build Of Keycloak 26.4.13
- Red Hat Build Of Keycloak 26.6 — versions 26.6-8, 26.6-6, 26.6.3-3
- Red Hat Build Of Keycloak 26.6.3
- Red Hat Build Of Keycloak 26.6.4
- Red Hat Build Of Keycloak
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/security/cve/CVE-2026-9794 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:25098 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:25097 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:30049 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:30050 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-9794?
- CVE-2026-9794 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 5.3/10. Published 2026-05-28.
- How severe is CVE-2026-9794?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2026-9794 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.