What is CVE-2025-54391?

CVE-2025-54391 is a critical-severity vulnerability in N/a, classified under Improper Access Control. CVSS score: 9.1/10. Published 2025-09-16.

How severe is CVE-2025-54391?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in N/a

CVE-2025-54391

A vulnerability in the EnableTwoFactorAuthRequest SOAP endpoint of Zimbra Collaboration (ZCS) allows an attacker with valid user credentials to bypass Two-Factor Authentication (2FA) protection. The attacker can configure an additional 2FA method (either a third-party authenticator app or email-based 2FA) without presenting a valid authentication token or proving access to an already configured 2FA method. This bypasses 2FA and results in unauthorized access to accounts that are otherwise protected by 2FA.

EPSS: 0.006 (44.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

Frequently asked questions

What is CVE-2025-54391?: CVE-2025-54391 is a critical-severity vulnerability in N/a, classified under Improper Access Control. CVSS score: 9.1/10. Published 2025-09-16.
How severe is CVE-2025-54391?: Critical severity. CVSS v3 base score is 9.1 out of 10.