CVE-2026-47201
authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user
CVSS Score
8.5
EPSS Score
0.1%
EPSS Percentile
20th
authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik's SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstream SAML responses. An attacker with any account at the upstream IdP can reuse a valid signed assertion to authenticate as another federated user. This issue has been patched in versions 2025.12.5, 2026.2.3, and 2026.5.1.
| CWE | CWE-20 |
| Vendor | goauthentik |
| Product | authentik |
| Published | Jun 2, 2026 |
| Last Updated | Jun 3, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
goauthentik / authentik
< 2025.12.5 < 2026.2.3 < 2026.5.1