What is CVE-2026-40871?

CVE-2026-40871 is a high-severity vulnerability in Mailcow Mailcow-dockerized, classified under Improper Input Validation. CVSS score: 7.2/10. Published 2026-04-21.

How severe is CVE-2026-40871?

High severity. CVSS v3 base score is 7.2 out of 10.

SQL Injection in Mailcow Mailcow-dockerized

CVE-2026-40871

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…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.001 (22.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mailcow Mailcow-dockerized — versions < 2026-03b

Weakness classification (CWE)

References

https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-r8fq-wrfm-cj2q (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-40871?: CVE-2026-40871 is a high-severity vulnerability in Mailcow Mailcow-dockerized, classified under Improper Input Validation. CVSS score: 7.2/10. Published 2026-04-21.
How severe is CVE-2026-40871?: High severity. CVSS v3 base score is 7.2 out of 10.