CVE-2026-9794: Generation of Error Message Containing Sensitive Information in Red Hat Red Hat build of Keycloak 26.4
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.
AI Analysis
Technical Summary
The vulnerability CVE-2026-9794 affects Red Hat build of Keycloak 26.4 and involves generation of error messages containing sensitive information. An unauthenticated remote attacker can exploit this by sending specially crafted SOAP requests to the SAML ECP endpoint with varying client IDs. The attacker can distinguish different faultstrings in the responses, thereby determining the client's protocol type and causing information disclosure. This issue is part of a set of security fixes included in Red Hat build of Keycloak 26.6.3. The vendor advisory does not explicitly state a patch for version 26.4 but provides updated images at 26.6.3 that address this vulnerability.
Potential Impact
The vulnerability allows remote unauthenticated attackers to gain information about client protocol types by analyzing error messages returned from the SAML ECP endpoint. This leads to information disclosure (confidentiality impact) without affecting integrity or availability. The CVSS v3.1 base score is 5.3 (medium severity), reflecting the limited impact scope focused on confidentiality only.
Mitigation Recommendations
Red Hat has released updated Keycloak 26.6.3 images that address CVE-2026-9794 along with other vulnerabilities. Users should upgrade to Red Hat build of Keycloak 26.6.3 to remediate this issue. Before applying the update, back up existing installations, including applications, configuration files, and databases. Patch status for version 26.4 is not explicitly stated; therefore, check the Red Hat advisory for the latest remediation guidance.
CVE-2026-9794: Generation of Error Message Containing Sensitive Information in Red Hat Red Hat build of Keycloak 26.4
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.
CVSS v3.1
Score 5.3medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-9794 affects Red Hat build of Keycloak 26.4 and involves generation of error messages containing sensitive information. An unauthenticated remote attacker can exploit this by sending specially crafted SOAP requests to the SAML ECP endpoint with varying client IDs. The attacker can distinguish different faultstrings in the responses, thereby determining the client's protocol type and causing information disclosure. This issue is part of a set of security fixes included in Red Hat build of Keycloak 26.6.3. The vendor advisory does not explicitly state a patch for version 26.4 but provides updated images at 26.6.3 that address this vulnerability.
Potential Impact
The vulnerability allows remote unauthenticated attackers to gain information about client protocol types by analyzing error messages returned from the SAML ECP endpoint. This leads to information disclosure (confidentiality impact) without affecting integrity or availability. The CVSS v3.1 base score is 5.3 (medium severity), reflecting the limited impact scope focused on confidentiality only.
Mitigation Recommendations
Red Hat has released updated Keycloak 26.6.3 images that address CVE-2026-9794 along with other vulnerabilities. Users should upgrade to Red Hat build of Keycloak 26.6.3 to remediate this issue. Before applying the update, back up existing installations, including applications, configuration files, and databases. Patch status for version 26.4 is not explicitly stated; therefore, check the Red Hat advisory for the latest remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-05-28T03:15:11.408Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-9794","vendor":"Red Hat"}]
Threat ID: 6a184ec5e29bf47b50f3f9bd
Added to database: 05/28/2026, 14:18:45 UTC
Last enriched: 06/26/2026, 12:22:38 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 95
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