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CVE-2026-40172— authentik: Privilege Escalation via User PATCH: Superuser Group Assignment Bypasses enable_group_superuser

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之前版本和2026.2.0-rc1至2026.2.2版本存在安全漏洞，该漏洞源于PATCH /api/v3/core/users/{pk}/ API允许调用者通过UserSerializer分配任意组，包括is_superuser=True的组，可能导致权限提升。

CVSS 8.1 · High EPSS 0.72% · P52

Affected Version Matrix 2

VendorProduct Version RangeStatus
goauthentik authentik < 2025.12.5 affected
>= 2026.2.0-rc1, < 2026.2.3 affected
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I. Basic Information for CVE-2026-40172

Vulnerability Information
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Vulnerability Title
authentik: Privilege Escalation via User PATCH: Superuser Group Assignment Bypasses enable_group_superuser
Source: CVE Program / CVE List V5
Vulnerability Description
authentik is an open-source identity provider. In versions prior to 2025.12.5 and 2026.2.0-rc1 through 2026.2.2, the PATCH /api/v3/core/users/{pk}/ API allows a caller with change_user on a target user to assign arbitrary groups through UserSerializer, including groups with is_superuser=True, without requiring enable_group_superuser, leading to privilege escalation. This bypasses the stricter permission model enforced in group-management paths and enables delegated user-management permissions to escalate target users to administrator-equivalent privilege. Users with permissions to update groups or permissions to update users are able to add themselves or other users they have permissions on to users which have superuser permissions. This issue has been fixed in versions 22025.12.5 and 2026.2.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
authentik 安全漏洞
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之前版本和2026.2.0-rc1至2026.2.2版本存在安全漏洞，该漏洞源于PATCH /api/v3/core/users/{pk}/ API允许调用者通过UserSerializer分配任意组，包括is_superuser=True的组，可能导致权限提升。
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-2026-40172

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8097 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-40172

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Vendor Advisories for CVE-2026-40172 (1)

Vendor Pages for CVE-2026-40172 (1)

Other References for CVE-2026-40172 (1)

IV. Related Vulnerabilities

Same product: authentik
Same vendor: goauthentik
Same weakness: CWE-269

V. Comments for CVE-2026-40172

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