PT-2026-42826 · Authentik · Authentik

Published 2026-05-22 · Updated 2026-06-01 · CVE-2026-40166

Positive Technologies (AI Summary)

CVSS v4.0

7.1

High

Base vector

AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions authentik versions prior to 2025.12.5 authentik versions 2026.2.0-rc1 through 2026.2.2

Description Authenticated non-admin users possessing at least one OAuth2 access token can retrieve the client secret of confidential OAuth2 providers they have previously used for authentication. This occurs via the 'GET /api/v3/oauth2/access tokens/' endpoint, where the API response includes a nested provider object containing the client id and client secret for providers configured with client type: confidential. This exposes sensitive information to users lacking the necessary permissions.

Recommendations Update to version 2025.12.5 Update to version 2026.2.3

Exploit

Fix

Information Disclosure

Incorrect Authorization

Weakness Enumeration

CWE-200

CWE-863

Related Identifiers

BIT-AUTHENTIK-2026-40166

CVE-2026-40166

GHSA-HHPC-RQGM-PXJ4

Affected Products

Authentik

References · 10

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40166.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-40166 · Security Note
• https://osv.dev/vulnerability/BIT-authentik-2026-40166 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-40166 · Vendor Advisory
• https://github.com/goauthentik/authentik/security/advisories/GHSA-hhpc-rqgm-pxj4 · Note
• https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.5 · Note
• https://github.com/goauthentik/authentik/releases/tag/version%2F2026.2.3 · Note
• https://twitter.com/CVEnew/status/2058155793506341322 · Twitter Post
• https://t.me/CVEtracker/54662 · Telegram Post
• https://twitter.com/infoflowcloud/status/2058156339210146018 · Twitter Post