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

CVSS 8.1 · High EPSS 0.01% · P1

Affected Version Matrix 2

VendorProductVersion RangeStatus
goauthentikauthentik< 2025.12.5affected
>= 2026.2.0-rc1, < 2026.2.3affected
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
特权管理不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
goauthentikauthentik < 2025.12.5 -

II. Public POCs for CVE-2026-40172

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8087 chars
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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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