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CVE-2026-49448— authentik: SourceStage bypass via empty POST

CVSS 9.8 · Critical EPSS 0.40% · P34

Affected Version Matrix 3

VendorProductVersion RangeStatus
goauthentikauthentik< 2025.12.6affected
< 2026.2.4affected
< 2026.5.1affected
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I. Basic Information for CVE-2026-49448

Vulnerability Information
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Vulnerability Title
authentik: SourceStage bypass via empty POST
Source: CVE Program / CVE List V5
Vulnerability Description
authentik is an open-source identity provider. Prior to versions 2025.12.6, 2026.2.4, and 2026.5.1, the Source stage can be bypassed by sending an empty POST. This issue has been patched in versions 2025.12.6, 2026.2.4, and 2026.5.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
authentik 授权问题漏洞
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 2025.12.6之前版本、2026.2.4之前版本和2026.5.1之前版本存在授权问题漏洞，该漏洞源于发送空POST请求可能绕过Source阶段。
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

VendorProductAffected VersionsCPESubscribe
goauthentikauthentik < 2025.12.6 -

II. Public POCs for CVE-2026-49448

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 6101 chars
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III. Intelligence Information for CVE-2026-49448

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Vendor Advisories for CVE-2026-49448 (1)

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

CVE-2026-428499.3 CRITICALauthentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover
CVE-2026-494438.8 HIGHauthentik: `UserSourceConnection.user` and `GroupSourceConnection.group` are changeable th
CVE-2026-472018.5 HIGHauthentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary fe
CVE-2026-41577authentik: SAML source does not validate Conditions, timing, or audience on assertions
CVE-2026-41569authentik: WS-Federation wreply origin bypass can exfiltrate signed login responses to att

IV. Related Vulnerabilities

Same product: authentik
Same vendor: goauthentik
Same weakness: CWE-287

V. Comments for CVE-2026-49448

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