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TI-2020-16897 Aliases CVE-2020-27826GHSA-m9cj-v55f-8x26

A flaw was found in Keycloak before version 12.0.0 where it is possible to update the…

Priority LOW 20CWE-250Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Privilege escalation
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-250.

Summary

A flaw was found in Keycloak before version 12.0.0 where it is possible to update the user's metadata attributes using Account REST API. This flaw allows an attacker to change its own NameID attribute to impersonate the admin user for any particular application.

Why it matters now

EPSS 0.00572 47th percentileScored 2026-11-07
Fix Fixed org.keycloak:keycloak-core (Maven): 12.0.0Red Hat: 4 advisories

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
—keycloakkeycloak 12.0.0—No fix listedCNA
—org.keycloak:keycloak-core (Maven)before 12.0.012.0.0Patch availableGHSA-m9cj-v55f-8x26
  • keycloak Vendor— Affected keycloak 12.0.0 Fixed in — No fix listed CNA
  • org.keycloak:keycloak-core (Maven) Vendor— Affected before 12.0.0 Fixed in 12.0.0 Patch available GHSA-m9cj-v55f-8x26

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*before 12.0.0VulnerableRed Hat
cpe:2.3:a:redhat:single_sign-on:-:*:*:*:text-only:*:*:*not specified by NVDVulnerableRed Hat
cpe:2.3:a:redhat:single_sign-on:7.4:*:*:*:*:*:*:*7.4VulnerableRed Hat
cpe:2.3:a:redhat:single_sign-on:7.4.4:*:*:*:*:*:*:*7.4.4VulnerableRed Hat
  • cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:* Versions before 12.0.0 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:single_sign-on:-:*:*:*:text-only:*:*:* Versions not specified by NVD Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:single_sign-on:7.4:*:*:*:*:*:*:* Versions 7.4 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:single_sign-on:7.4.4:*:*:*:*:*:*:* Versions 7.4.4 Vulnerable ·Red Hat

Remediation

  • Fix · GHSA-m9cj-v55f-8x26 org.keycloak:keycloak-core (Maven) Fixed in 12.0.0 Advisory →

Red Hat 4 advisories

  • RHSA-2020:5528 Released 2020-12-15 · Red Hat rating Low
    Red Hat Single Sign-On 7.4.4 security update on RHEL 8
    • Red Hat Single Sign-On 7.4 for RHEL 8 rh-sso7-keycloak-9.0.10-1.redhat_00001.1.el8sso, rh-sso7-keycloak-server-9.0.10-1.redhat_00001.1.el8sso
  • RHSA-2020:5533 Released 2020-12-15 · Red Hat rating Important
    Red Hat Single Sign-On 7.4.4 security update
    • Red Hat Single Sign-On 7
  • RHSA-2020:5527 Released 2020-12-15 · Red Hat rating Low
    Red Hat Single Sign-On 7.4.4 security update on RHEL 7
    • Red Hat Single Sign-On 7.4 for RHEL 7 Server rh-sso7-keycloak-9.0.10-1.redhat_00001.1.el7sso, rh-sso7-keycloak-server-9.0.10-1.redhat_00001.1.el7sso
Show 1 more Red Hat advisories
  • RHSA-2020:5526 Released 2020-12-15 · Red Hat rating Low
    Red Hat Single Sign-On 7.4.4 security update on RHEL 6
    • Red Hat Single Sign-On 7.4 for RHEL 6 Server rh-sso7-keycloak-9.0.10-1.redhat_00001.1.el6sso, rh-sso7-keycloak-server-9.0.10-1.redhat_00001.1.el6sso

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Single Sign-On 7Fixed RHSA-2020:5533
Red Hat Single Sign-On 7.4 for RHEL 6 ServerFixed RHSA-2020:5526
Red Hat Single Sign-On 7.4 for RHEL 7 ServerFixed RHSA-2020:5527
Red Hat Single Sign-On 7.4 for RHEL 8Fixed RHSA-2020:5528

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-27826
  2. 2026-10-03 Alias added: GHSA-m9cj-v55f-8x26
  3. 2026-11-04 Fix available: Red Hat Single Sign-On 7 · Red Hat

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