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CVE-2026-47201— authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user

Quick assessment

Affected
goauthentik authentik
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

authentik是authentik开源的一个身份提供应用程序。 authentik 2025.12.5之前版本、2026.2.3之前版本和2026.5.1之前版本存在输入验证错误漏洞，该漏洞源于SAML Source ACS端点验证上游SAML响应时存在XML签名包装漏洞，可能导致攻击者重用有效签名断言以其他联合用户身份进行认证。

CVSS 8.5 · High EPSS 0.18% · P8

Affected Version Matrix 3

VendorProduct Version RangeStatus
goauthentik authentik < 2025.12.5 affected
< 2026.2.3 affected
< 2026.5.1 affected
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I. Basic Information for CVE-2026-47201

Vulnerability Information
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Vulnerability Title
authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
authentik 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
authentik是authentik开源的一个身份提供应用程序。 authentik 2025.12.5之前版本、2026.2.3之前版本和2026.5.1之前版本存在输入验证错误漏洞，该漏洞源于SAML Source ACS端点验证上游SAML响应时存在XML签名包装漏洞，可能导致攻击者重用有效签名断言以其他联合用户身份进行认证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
goauthentik authentik < 2025.12.5 -

II. Public POCs for CVE-2026-47201

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10060 chars
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III. Intelligence Information for CVE-2026-47201

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Vendor Advisories for CVE-2026-47201 (1)

Same Patch Batch · goauthentik · 2026-06-02 · 6 CVEs total

CVE-2026-49448 9.8 CRITICAL authentik: SourceStage bypass via empty POST
CVE-2026-42849 9.3 CRITICAL authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover
CVE-2026-49443 8.8 HIGH authentik: `UserSourceConnection.user` and `GroupSourceConnection.group` are changeable th
CVE-2026-41577 authentik: SAML source does not validate Conditions, timing, or audience on assertions
CVE-2026-41569 authentik: WS-Federation wreply origin bypass can exfiltrate signed login responses to att

IV. Related Vulnerabilities

Same product: authentik
Same vendor: goauthentik
Same weakness: CWE-20

V. Comments for CVE-2026-47201

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