CVE-2026-47201
High
Description
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.
SeverityHigh
CVSS8.5
Exploit probability—
ProductAuthentik
PublishedJun 2, 2026
First seenJun 2, 2026
Weakness typeCWE-20Improper input validation
How to fix
Update
- goauthentik authentik2025.12.6, 2026.2.4, 2026.5.1 or later
- goauthentik.io0.0.0-20260528144335-a370d76d23c7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| goauthentik authentik | v < 2025.12.6, 2026.2.0 ≤ v < 2026.2.4, 2026.5.0 ≤ v < 2026.5.1 | 2025.12.6, 2026.2.4, 2026.5.1 |
| goauthentik.ioGo | v < 0.0.0-20260528144335-a370d76d23c7 | 0.0.0-20260528144335-a370d76d23c7 |
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