VulnSocial

CVE-2026-40166Disclosure

LOWCVSS 7.1 · HIGH

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-200CWE-863

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

  • 2 mentions across 1 observed day

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • 2 total mentions across 1 day

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-05-23: 2Technical Details · 2026-05-23: 205-23
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
By indicator
Full discourse2 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-40166 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 OAuth… https://www.cve.org/CVERecord?id=CVE-2026-40166 ----- Traducción: CVE-2026-40166 aut… http://infoflow.cloud`

    Post summary

    The post highlights CVE-2026-40166, stating that authenticated non‑admin users in specified authentik versions can abuse OAuth, and links to the official CVE record.

    0000040
    79 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-40166 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 OAuth… https://www.cve.org/CVERecord?id=CVE-2026-40166

    Post summary

    The snippet announces CVE‑2026‑40166 for authentik, noting vulnerable versions and that authenticated non‑admin users can abuse an OAuth flaw. No PoC, exploit code, or active exploitation evidence is provided.

    00000219
    57.5K followersView on X

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