CVE-2023-23566

Name: CVE-2023-23566
Creator: NVD / NIST
Published: 2023-01-13T04:15:09.377+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.95%

Last modified Jun 17, 2026

CVE-2023-23566 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A 2-Step Verification problem in Axigen 10.3.3.52 allows an attacker to access a mailbox by bypassing 2-Step Verification when they try to add an account to any third-party webmail service (or add an account to Outlook or Gmail, etc.) with IMAP or POP3 without any verification code.. EPSS estimates a 0.95% chance of exploitation in the next 30 days.

Description

A 2-Step Verification problem in Axigen 10.3.3.52 allows an attacker to access a mailbox by bypassing 2-Step Verification when they try to add an account to any third-party webmail service (or add an account to Outlook or Gmail, etc.) with IMAP or POP3 without any verification code.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.95%

56.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-276

Affected Software

Vendor	Product	Versions
Axigen	Axigen Mail Server	10.3.3.52

References

https://github.com/umz-cert/vulnerabilities/issues/1Third Party Advisory
https://github.com/umz-cert/vulnerabilitys/blob/patch-1/Axigen%20Mail%20Server%2010.3.3.52%202-Step%20verificationThird Party Advisory
https://www.axigen.com/documentation/2-step-verification-two-factor-authentication-for-webmail-p69140479Technical Description, Vendor Advisory
https://www.axigen.com/mail-server/download/Vendor Advisory
https://github.com/umz-cert/vulnerabilities/issues/1Third Party Advisory
https://github.com/umz-cert/vulnerabilitys/blob/patch-1/Axigen%20Mail%20Server%2010.3.3.52%202-Step%20verificationThird Party Advisory
https://www.axigen.com/documentation/2-step-verification-two-factor-authentication-for-webmail-p69140479Technical Description, Vendor Advisory
https://www.axigen.com/mail-server/download/Vendor Advisory

Timeline

Published: Jan 13, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-23566?

How severe is CVE-2023-23566?

CVE-2023-23566 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.95% probability of exploitation in the next 30 days.

How do I fix CVE-2023-23566?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-23566?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST