CVE-2026-47201 | THREATINT

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.

PUBLISHED Reserved 2026-05-18 | Published 2026-06-02 | Updated 2026-06-03 | Assigner GitHub_M

HIGH: 8.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Problem types

CWE-20: Improper Input Validation

Product status

< 2025.12.5

affected

< 2026.2.3

affected

< 2026.5.1

affected

References

github.com/...hentik/security/advisories/GHSA-c3m2-jqmq-pvp3

cve.org (CVE-2026-47201)

nvd.nist.gov (CVE-2026-47201)

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