Threat Intelligence Database

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known.

CVE-2026-27860 is an LDAP injection vulnerability in Open-Xchange GmbH's OX Dovecot Pro. It occurs if the configuration parameter auth_username_chars is empty, allowing injection of arbitrary LDAP filters during LDAP authentication. This can potentially bypass restrictions and enable probing of the LDAP structure. No public exploits are known, and the vulnerability has a low severity rating with a CVSS score of 3.7.

Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive. With 100k header lines CPU usage is already 12 seconds, and in a production environment we observed 500k header lines taking 18 minutes to parse. Since this can be triggered by external actors sending emails to a victim, this is a security issue. An external attacker can send specially crafted messages that consume target system resources and cause outage. One can implement restrictions on address headers on MTA component preceding Dovecot. No publicly available exploits are known.

MediumVulnerabilityGermanyUnited KingdomFrance+4#cve#cve-2024-23184