CVEvulnerability

CVE-2026-40871

7.2 HIGH Published 2026-04-21 Modified 2026-10-26 Official page ↗
Status
Deferred
Published
2026-04-21
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.2 HIGH — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-116, CWE-20, CWE-564, CWE-89

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.

Related

Weakness · CWE (4)

  • CWE-116 Improper Encoding or Escaping of Output weakness
  • CWE-20 Improper Input Validation weakness
  • CWE-564 Use of Hibernate with HQL/SQL Query String Containing External Input weakness
  • CWE-89 Improper Neutralization of Special Elements used in an SQL Command weakness

References