CVE-2026-47201 authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user
Attackers can authenticate as arbitrary federated users via XML Signature Wrapping in SAML responses, requiring an upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-47201?
CVE-2026-47201 is a high-severity authentication bypass vulnerability in goauthentik authentik, published on 2 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-47201?
3 open source packages ship an affected version, including goauthentik.io and authentik. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
goauthentik.io Go | All versions | 0.0.0-20260528144335-a370d76d23c7 |
goauthentik.io Go | All versions | 0.0.0-20260528144335-a370d76d23c7 |
authentik Bitnami | All versions | 2026.5.1 |
Products include Goauthentik Authentik.
How do I fix CVE-2026-47201?
Upgrade goauthentik.io to 0.0.0-20260528144335-a370d76d23c7 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-47201 being exploited?
There is no known exploitation of CVE-2026-47201 in the wild and no public exploit code.
Other vulnerabilities in goauthentik authentik
- CVE-2026-49448 authentik: SourceStage bypass via empty POST
- CVE-2023-46249 authentik potential installation takeover when default admin user is deleted
- CVE-2022-23555 authentik vulnerable to Improper Authentication via invitation URL token reuse
- CVE-2026-42849 authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover
- CVE-2026-25227 authentik affected by Remote Code Execution via Context Key Injection in PropertyMapping Test Endpoint
Sources
Also known as BIT-authentik-2026-47201, GHSA-c3m2-jqmq-pvp3.