Remote Code Execution in Dovecot by Open-Xchange
CVE-2026-40204

3.1LOW

Key Information:

Vendor

Open-xchange Gmbh

Status
Ox Dovecot Pro
Ox Dovecot Ce
Vendor
CVE Published:
28 August 2026

What is CVE-2026-40204?

The Remote Code Execution vulnerability in Dovecot by Open-Xchange could allow attackers to execute arbitrary code on the affected system. This flaw may pose significant risks if exploited, making it critical for users to apply security patches and updates as soon as they are available. Currently, no public exploits have been released, but the potential for abuse underlines the importance of mitigating such risks through prompt action.

Affected Version(s)

OX Dovecot CE 2.3.0 < 2.4.5

OX Dovecot Pro 2.3.0 < 2.3.22.2

OX Dovecot Pro 3.0.0 < 3.0.7

References

https://documentation.open-xchange.com/dovecot/security/a...
vendor-advisory

CVSS V3.1

Score:
3.1
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.