CVE-2026-47201

HIGH8.5EPSS 0.06%

authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user

Published: 5/29/2026Modified: 6/5/2026

Also known as:GHSA-c3m2-jqmq-pvp3BIT-authentik-2026-47201

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.

Affected packages (2)

Bitnami/authentikfrom 0, < 2026.5.1
Go/goauthentik.iofrom 0, < 0.0.0-20260528144335-a370d76d23c7

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH8.5	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References (4)

PATCHhttps://github.com/goauthentik/authentik
WEBhttps://github.com/goauthentik/authentik/commit/a370d76d23c7de0fceed064ca322e33e6ebf0119
WEBhttps://github.com/goauthentik/authentik/security/advisories/GHSA-c3m2-jqmq-pvp3
WEBhttps://nvd.nist.gov/vuln/detail/CVE-2026-47201