Federated-user impersonation via unbound signature reference
Published Jun 2, 2026 · Updated Jun 2, 2026
Authentication bypass in authentik before 2025.12.6, 2026.2.4, or 2026.5.1 allows remote authenticated users to impersonate federated users. The SAML response processor validates a signature without binding its Reference URI to the assertion or response whose identity data is consumed. Exploitation requires an upstream IdP account and an affected SAML Source; access is gained as a prior federated user or, with matching enabled, a local user.
Summary
What happened
Authentication bypass in authentik before 2025.12.6, 2026.2.4, or 2026.5.1 allows remote authenticated users to impersonate federated users. The SAML response processor validates a signature without binding its Reference URI to the assertion or response whose identity data is consumed. Exploitation requires an upstream IdP account and an affected SAML Source; access is gained as a prior federated user or, with matching enabled, a local user.
The record
- CVE
- CVE-2026-47201
- Published
- Jun 2, 2026
- Updated
- Jun 2, 2026
- Vendor
- Authentik Security Inc.
- Product
- authentik
- Classifications
- CWE-20, T1078
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 2, 2026CVE publishedPublication date reported by the CVE source.
- Jun 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2025.12.5
- Affected versionversion=< 2026.2.3
- Affected versionversion=< 2026.5.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo