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CVE-2026-54730— authentik: Authentication Flow Bypass via Unguarded challenge_valid() in AuthenticatorEndpointGDTCStage and GoogleChromeStageView

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 Security authentik是Authentik Security组织的一个用于现代 SSO 的开源身份提供商 (IdP)。 Authentik Security authentik 2026.2.6之前版本和2026.5.0至2026.5.5之前版本存在安全漏洞，该漏洞源于Google Chrome设备信任阶段未确认带外设备证明实际运行即推进流程，可能导致攻击者跳过验证iframe，从未经验证的设备进行身份验证。

CVSS 8.6 · High EPSS 0.37% · P31

Affected Version Matrix 2

VendorProduct Version RangeStatus
goauthentik authentik < 2026.2.6 affected
>= 2026.5.0, < 2026.5.5 affected
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I. Basic Information for CVE-2026-54730

Vulnerability Information
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Vulnerability Title
authentik: Authentication Flow Bypass via Unguarded challenge_valid() in AuthenticatorEndpointGDTCStage and GoogleChromeStageView
Source: CVE Program / CVE List V5
Vulnerability Description
authentik is an open-source identity provider. Prior to 2026.2.6 and 2026.5.5, the enterprise Google Chrome device-trust stages advance the flow without confirming that the out-of-band device attestation actually ran. Affected enterprise deployments place either a Google Chrome Endpoint stage with mode set to REQUIRED or the deprecated Google Chrome Device Trust Connector stage in an authentication flow. The device attestation occurs in a verification iframe that calls the Google Verified Access API and records the verified device on success, but the vulnerable stages treat the flow as passed as soon as the stage is submitted. An attacker who can reach such a stage, including after primary username and password authentication, can skip the verification iframe and authenticate from a device that was never verified. Where device trust is the only additional factor, that protection is fully bypassed, while other configured factors remain in force. This issue is fixed in versions 2026.2.6 and 2026.5.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Authentik Security authentik 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Authentik Security authentik是Authentik Security组织的一个用于现代 SSO 的开源身份提供商 (IdP)。 Authentik Security authentik 2026.2.6之前版本和2026.5.0至2026.5.5之前版本存在安全漏洞，该漏洞源于Google Chrome设备信任阶段未确认带外设备证明实际运行即推进流程，可能导致攻击者跳过验证iframe，从未经验证的设备进行身份验证。
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 < 2026.2.6 -

II. Public POCs for CVE-2026-54730

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10069 chars
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III. Intelligence Information for CVE-2026-54730

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Patches & Fixes for CVE-2026-54730 (4)

Vendor Advisories for CVE-2026-54730 (1)

Vendor Pages for CVE-2026-54730 (2)

Same Patch Batch · goauthentik · 2026-08-18 · 4 CVEs total

CVE-2026-57580 9.4 CRITICAL authentik: Account Takeover via SAML NameID Comment Truncation
CVE-2026-61574 8.8 HIGH authentik RAC: access any endpoint via an unrelated application
CVE-2026-55106 5.3 MEDIUM authentik: Unauthenticated LDAP directory data disclosure

IV. Related Vulnerabilities

Same product: authentik
Same vendor: goauthentik
Same weakness: CWE-284

V. Comments for CVE-2026-54730

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