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CVE-2026-40871— mailcow: dockerized vulnerable to Second Order SQL Injection in quarantine category via API

CVSS 7.2 · High EPSS 0.05% · P15
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I. Basic Information for CVE-2026-40871

Vulnerability Information
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Vulnerability Title
mailcow: dockerized vulnerable to Second Order SQL Injection in quarantine category via API
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
mailcow: dockerized 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mailcow: dockerized是mailcow开源的一个docker化的mailcow应用软件。 mailcow: dockerized 2026-03b之前版本存在安全漏洞，该漏洞源于quarantine_category字段存在二阶SQL注入，可能导致执行任意SQL并泄露敏感数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
mailcowmailcow-dockerized < 2026-03b -

II. Public POCs for CVE-2026-40871

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III. Intelligence Information for CVE-2026-40871

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Same Patch Batch · mailcow · 2026-04-21 · 6 CVEs total

CVE-2026-40875mailcow: dockerized vulnerable to stored XSS in user login history real_rip
CVE-2026-40872mailcow: dockerized vulnerable to stored XSS in autodiscover logs email address field
CVE-2026-40874mailcow: dockerized missing authorization on Forwarding Hosts delete action
CVE-2026-40873mailcow: dockerized vulnerable to stored XSS in Quarantine attachment filenames
CVE-2026-40878mailcow-dockerized Login Page has Reflected Parameter Injection / Wrong-Context XSS Escapi

IV. Related Vulnerabilities

Same product: mailcow-dockerized
Same vendor: mailcow
Same weakness: CWE-20

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