What is CVE-2026-111641?

CVE-2026-111641 is a critical-severity vulnerability in Fastapiadmin, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-10-16.

How severe is CVE-2026-111641?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Fastapiadmin

CVE-2026-111641

FastapiAdmin through 3.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to obtain sessions for any user by abusing unprotected auto-login endpoints. Attackers can list users via /api/v1/auth/auto-login/users, mint a superuser auto-login token, and exchange it for a JWT session to gain full administrative control.

Vulnerability class: Broken Authentication

Published 2026-10-16 · last modified 2026-10-16.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Fastapiadmin

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

hackmd.io/@hieuPenguinnn/fastapiadmin-unauthenticated-autologin-and-hardcoded-j… (third-party-advisory)
github.com/fastapiadmin/FastapiAdmin/blob/v3.0/backend/app/api/v1/module_system… (technical-description)
VulnCheck Advisory: FastapiAdmin through 3.0 Authentication Bypass via Auto-Login Endpoints (third-party-advisory)

Frequently asked questions

What is CVE-2026-111641?: CVE-2026-111641 is a critical-severity vulnerability in Fastapiadmin, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-10-16.
How severe is CVE-2026-111641?: Critical severity. CVSS v3 base score is 9.8 out of 10.