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CVE

CVE-2020-27826

A flaw was found in Keycloak before version 12.0.0 where it is possible to update the user's metadata attributes using A

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.

MEDIUM · CVSS 4.2 EPSS 0.00166
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-250Execution with Unnecessary Privileges
▤

Affected Products & Versions

2
redhat keycloak< 12.0.0
redhat single sign-onall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.keycloak:keycloak-core HIGH fixed in 12.0.0
▣

Scoring & Timeline

4.2
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 May 2021 · 11:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
⚑

Vendor Advisories

4
rhsaRHSA-2020:5533Low
rhsaRHSA-2020:5528Low
rhsaRHSA-2020:5527Low
rhsaRHSA-2020:5526Low
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=1905089Issue TrackingVendor Advisory
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