CVE-2026-47201 | authentik is an open-source identity provider. Prior to vers… | CVSS 8.5 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.

Metadata

CVE ID: CVE-2026-47201
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-18 22:07 UTC
Published: 2026-06-02 20:30 UTC
Last updated: 2026-06-03 14:08 UTC
Primary CWE: CWE-20
CWE-20: Improper Input Validation
Vendor / Product: goauthentik / authentik
Sources: cve.org · NVD

Severity & Metrics

8.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
goauthentik	authentik	—	< 2025.12.5, < 2026.2.3, < 2026.5.1

Weakness (CWE)

CWE	Source	Description
CWE-20	cna	CWE-20: Improper Input Validation

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References (1)

https://github.com/goauthentik/authentik/security/advisories/GHSA-c3m2-jqmq-pvp3 https://github.com/goauthentik/authentik/security/advisories/GHSA-c3m2-jqmq-pvp3