How severe is CVE-2023-23566?

CVE-2023-23566 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-23566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-23566?

CVE-2023-23566 affects Axigen Axigen Mail Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-23566?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-23566 published?

CVE-2023-23566 was published on 2023-01-13 and last updated on 2026-06-17.

CVE-2023-23566

CVE-2023-23566 is a critical-severity vulnerability in Axigen Axigen Mail Server with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-276.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Axigen Axigen Mail Server
Published: 2023-01-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-23566?: 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.
How severe is CVE-2023-23566?: CVE-2023-23566 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-23566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-23566?: CVE-2023-23566 affects Axigen Axigen Mail Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-23566?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-23566 published?: CVE-2023-23566 was published on 2023-01-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:axigen:axigen_mail_server:10.3.3.52:*:*:*:*:*:*:*

More vulnerabilities in Axigen Axigen Mail Server

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CVE-2025-68723 — Critical (CVSS 9.0): Axigen Mail Server before 10.5.57 contains multiple stored Cross-Site Scripting (XSS) vulnerabilities in the WebAdmin…
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CVE-2025-68721 — High (CVSS 8.1): Axigen Mail Server before 10.5.57 contains an improper access control vulnerability in the WebAdmin interface. A…
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