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TI-2020-16908 Aliases CVE-2020-27838GHSA-pcv5-m2wh-66j3

Improper authentication in keycloak

Priority MEDIUM 46CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-287.

Summary

A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.

Why it matters now

EPSS 0.17866 97th percentileScored 2026-11-07
Fix Partial org.keycloak:keycloak-core (Maven): 13.0.0Red Hat: 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—keycloakkeycloak 13.0.0—No fix listedCNA
—org.keycloak:keycloak-core (Maven)before 13.0.013.0.0Patch availableGHSA-pcv5-m2wh-66j3
  • keycloak Vendor— Affected keycloak 13.0.0 Fixed in — No fix listed CNA
  • org.keycloak:keycloak-core (Maven) Vendor— Affected before 13.0.0 Fixed in 13.0.0 Patch available GHSA-pcv5-m2wh-66j3

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*before 13.0.0VulnerableRed Hat
cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
  • cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:* Versions before 13.0.0 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat

Remediation

  • Fix · GHSA-pcv5-m2wh-66j3 org.keycloak:keycloak-core (Maven) Fixed in 13.0.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Single Sign-On 7AffectedNo fix yet
Not affected: 6 products
  • Red Hat Decision Manager 7
  • Red Hat Fuse 7
  • Red Hat Integration Camel K 1
  • Red Hat OpenShift Application Runtimes
  • Red Hat Process Automation 7
  • Red Hat support for Spring Boot

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-27838
  2. 2026-10-03 Alias added: GHSA-pcv5-m2wh-66j3

References

Advisory 2

Other 2

  • TI-2024-01049 Keycloak: path transversal in redirection validation CVSS 3.1HIGH 8.1
  • TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
  • TI-2020-08665 Server-side request forgery in keycloak CVSS 3.1MEDIUM 5.3
  • TI-2022-03468 Path traversal in Red Hat Keycloak CVSS 3.1CRITICAL 9.1
  • TI-2021-03612 A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak. CVSS 3.1MEDIUM 6.1
  • TI-2022-03994 Cross-site scripting in keycloak CVSS 3.1CRITICAL 10.0
See all 97 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences