Description
mailcow: dockerized is an open source groupware/email suite based on docker. Versions prior to 2026-03b have a second-order SQL injection vulnerability in the quarantine_category field via the Mailcow API. The /api/v1/add/mailbox endpoint stores quarantine_category without validation or sanitization. This value is later used by quarantine_notify.py, which constructs SQL queries using unsafe % string formatting instead of parameterized queries. This results in a delayed (second-order) SQL injection when the quarantine notification job executes, allowing an attacker to inject arbitrary SQL. Using a UNION SELECT, sensitive data (e.g., admin credentials) can be exfiltrated and rendered inside quarantine notification emails. Version 2026-03b fixes the vulnerability.
Problem types
CWE-20: Improper Input Validation
CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CWE-116: Improper Encoding or Escaping of Output
CWE-564: SQL Injection: Hibernate
Product status
References
github.com/...erized/security/advisories/GHSA-r8fq-wrfm-cj2q
github.com/...erized/security/advisories/GHSA-r8fq-wrfm-cj2q