What is CVE-2026-40172?

CVE-2026-40172 is a high-severity vulnerability in Goauthentik Authentik, classified under Improper Privilege Management. CVSS score: 8.1/10. Published 2026-05-22.

How severe is CVE-2026-40172?

High severity. CVSS v3 base score is 8.1 out of 10.

Privilege escalation in Goauthentik Authentik

CVE-2026-40172

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 Us…

Vulnerability class: Privilege Escalation

EPSS: 0.000 (1.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

Affected products

Goauthentik Authentik — versions < 2025.12.5, >= 2026.2.0-rc1, < 2026.2.3

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-40172?: CVE-2026-40172 is a high-severity vulnerability in Goauthentik Authentik, classified under Improper Privilege Management. CVSS score: 8.1/10. Published 2026-05-22.
How severe is CVE-2026-40172?: High severity. CVSS v3 base score is 8.1 out of 10.