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.
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Wed, 22 Apr 2026 00:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | mailcow: dockerized vulnerable to Second Order SQL Injection in quarantine category via API | |
| Weaknesses | CWE-116 CWE-20 CWE-564 CWE-89 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-04-21T20:36:30.751Z
Reserved: 2026-04-15T15:57:41.718Z
Link: CVE-2026-40871
Updated: 2026-04-21T19:53:44.291Z
Status : Received
Published: 2026-04-21T20:17:00.527
Modified: 2026-04-21T21:16:43.340
Link: CVE-2026-40871
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