Security readout for executives and security teams
Plain-English summary
Keycloak before 12.0.0 allowed a user to change certain account metadata through the Account REST API. The reported impact is serious: a user could set their own NameID attribute to impersonate an admin user for a particular application.
Executive priority
Treat as high priority where Keycloak backs business applications with privileged roles. The main business risk is unauthorized application-level admin impersonation, not broad infrastructure compromise shown by these sources.
Technical view
The issue is described as improper privilege handling around Account REST API metadata updates. A user could modify their own NameID attribute, affecting identity assertions consumed by an application and enabling admin impersonation in that application context.
Likely exposure
Exposure is likely limited to Keycloak deployments before 12.0.0 that allow affected Account REST API metadata behavior and use NameID-dependent application authorization or identity mapping.
Exploitation context
The provided sources do not show CISA KEV listing, active exploitation, public exploit code, or exploitation volume. Exploitability depends on application reliance on mutable NameID metadata.
Researcher notes
Evidence is sparse: no CVSS, no detailed advisory text, and only one Red Hat Bugzilla reference is provided. Validate affected version boundaries and fixed builds against vendor records before asserting scope.
Mitigation direction
- Confirm whether any Keycloak deployment is before version 12.0.0.
- Upgrade affected Keycloak instances following vendor guidance.
- Review applications that map privileges from NameID values.
- Restrict account metadata changes where vendor-supported controls exist.
- Check Red Hat advisories for exact fixed versions and backports.
Validation and detection
- Inventory Keycloak versions across production and non-production environments.
- Review whether applications trust NameID for admin identity mapping.
- Audit Account REST API account metadata change history if logs exist.
- Confirm upgraded instances no longer allow unsafe NameID self-modification.
- Check for accounts whose NameID unexpectedly matches privileged users.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-250: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-27826 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.redhat.com/show_bug.cgi?id=1905089CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Execution with Unnecessary Privileges
Execution with Unnecessary Privileges represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.