CVE-2026-40166— authentik: Non-admin user can retrieve confidential OAuth client_secret via /api/v3/oauth2/access_tokens/
Possible ATT&CK Techniques 1AI
T1530 · Data from Cloud StorageAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| goauthentik | authentik | < 2025.12.5 | affected |
>= 2026.2.0-rc1, < 2026.2.3 | affected |
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I. Basic Information for CVE-2026-40166
Vulnerability Information
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Vulnerability Title
authentik: Non-admin user can retrieve confidential OAuth client_secret via /api/v3/oauth2/access_tokens/
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, authenticated non-admin users with at least one OAuth2 access token can retrieve the client_secret of confidential OAuth2 providers they have previously authenticated against, exposing sensitive information to users without the correct permissions. This logic is GET /api/v3/oauth2/access_tokens/. The API response includes a nested provider object containing client_id and client_secret for providers configured with client_type: confidential, which should not be accessible to low-privilege users. This issue has been fixed in versions 2025.12.5 and 2026.2.3.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
信息暴露
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| goauthentik | authentik | < 2025.12.5 | - |
II. Public POCs for CVE-2026-40166
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-40166 (1)
Vendor Pages for CVE-2026-40166 (1)
- Release Release 2025.12.5 · goauthentik/authentik · GitHubx_refsource_MISC
Other References for CVE-2026-40166 (1)
- Release Release 2026.2.3 · goauthentik/authentik · GitHubx_refsource_MISC
IV. Related Vulnerabilities
Same product: authentik
- CVE-2026-40172
authentik: Privilege Escalation via User PATCH: Superuser Gr - CVE-2026-40165
authentik: SAML NameID XML Comment Injection Enables Authent - CVE-2026-25922
authentik has a Signature Verification Bypass via SAML Asser - CVE-2026-25748
authentik has a forward authentication bypass with broken co - CVE-2026-25227
authentik affected by Remote Code Execution via Context Key
Same vendor: goauthentik
- CVE-2026-40172
authentik: Privilege Escalation via User PATCH: Superuser Gr - CVE-2026-40165
authentik: SAML NameID XML Comment Injection Enables Authent - CVE-2026-25922
authentik has a Signature Verification Bypass via SAML Asser - CVE-2026-25748
authentik has a forward authentication bypass with broken co - CVE-2026-25227
authentik affected by Remote Code Execution via Context Key
Same weakness: CWE-200
- CVE-2026-3636
Sanitize team member data returned by API - CVE-2026-7636
Slider by Soliloquy <= 2.8.1 - Authenticated (Subscriber+) I - CVE-2026-44409
Information disclosure vulnerability in ZTE MU5250 - CVE-2026-6826
Concrete 9.5.0 and below has file usage disclosure via missi - CVE-2025-31985
HCL BigFix Service Management (SM) is affected by a security
V. Comments for CVE-2026-40166
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