Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-r8fq-wrfm
- https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-r8fq-wrfm
FAQ
What is CVE-2026-40871?
CVE-2026-40871 is a vulnerability with a CVSS score of 7.2 (HIGH). 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...
How severe is CVE-2026-40871?
CVE-2026-40871 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-40871?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.