What’s Vulnerable › Vulnerabilities

CVE-2020-27826

• Severity: medium (CVSS 4.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-28 · updated 2026-06-17
• Weakness: CWE-250

Description

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.

Affected products

• Keycloak: before 12.0.0 — fixed in 12.0.0
• Red Hat Single Sign-On: 7.4, 7.4.4

How to fix

Upgrade to a fixed version: Keycloak 12.0.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1905089
• https://bugzilla.redhat.com/show_bug.cgi?id=1905089

Get alerted when CVE-2020-27826 or the next vulnerability affects your stack