CVE-2026-27860lowCWE-90

CVE-2026-27860: low-severity vulnerability in Open-Xchange GmbH OX Dovecot Pro

Published

Follow this CVE+ Monitor OX Dovecot Pro+ Monitor dovecot

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

8Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 3.7epss 0.3%
If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly available exploits are known.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
Open-Xchange GmbH · OX Dovecot Pro
Related CVEs — Open-Xchange GmbH OX Dovecot Pro

In the same product, most dangerous first.

CVE-2024-23185HIGHCVE-2024-23185EPSS 1.3%CVE-2026-40013MEDIUMCVE-2026-40013EPSS 0.9%CVE-2024-23184MEDIUMCVE-2024-23184EPSS 0.8%CVE-2026-27858HIGHCVE-2026-27858EPSS 0.8%CVE-2025-59032HIGHCVE-2025-59032EPSS 0.7%CVE-2026-27857MEDIUMCVE-2026-27857EPSS 0.7%