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Vulnerabilities

Vulnerability · CVE-2026-4366

A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests.

Published Mar 18, 2026 · catalog updated Jun 17, 2026 · build of keycloak

Check if you run it

No confirmed exploitation is on record for CVE-2026-4366. EPSS is 0.41%. Act only if a listed version of build of keycloak is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.41%
Remediation
Advisory link
Affected products
cpe redhat/build of keycloak · cpe redhat/jboss enterprise application platform · cpe redhat/jboss enterprise application platform expansion pack · cpe redhat/single sign-on

A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe redhat/build of keycloakversion unspecified
  • cpe redhat/jboss enterprise application platform8.0.0
  • cpe redhat/jboss enterprise application platform expansion packversion unspecified
  • cpe redhat/single sign-on7.0

How to fix CVE-2026-4366

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-4366. EPSS is 0.41%. Act only if a listed version of build of keycloak is installed.

Which versions are affected?

Compare what you have installed with redhat/jboss enterprise application platform 8.0.0; redhat/single sign-on 7.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-918: Server-Side Request Forgery (SSRF). EPSS 0.41%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 18, 2026 · NIST NVD

    Detected

    A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This iss

  2. Jun 17, 2026 · NIST NVD

    Updated

    A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This iss

Sources

  • CVE.orgVulnerability recordCVE-2026-4366

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-4366

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-4366

    A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or res

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.