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CVE-2026-40874— mailcow: dockerized missing authorization on Forwarding Hosts delete action

Quick assessment

Affected
mailcow mailcow-dockerized
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mailcow: dockerized是mailcow开源的一个docker化的mailcow应用软件。 mailcow: dockerized 2026-03b之前版本存在访问控制错误漏洞，该漏洞源于删除转发主机时未进行管理员验证，可能导致任何经过身份验证的用户调用此API并严重破坏邮件服务。

AI Predicted 8.1 Difficulty: Easy EPSS 0.27% · P18
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I. Basic Information for CVE-2026-40874

Vulnerability Information
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Vulnerability Title
mailcow: dockerized missing authorization on Forwarding Hosts delete action
Source: CVE Program / CVE List V5
Vulnerability Description
mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, no administrator verification takes place when deleting Forwarding Hosts with `/api/v1/delete/fwdhost`. Any authenticated user can call this API. Checks are only applied for edit/add actions, but deletion can still significantly disrupt the mail service. Version 2026-03b fixes the vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
mailcow: dockerized 访问控制错误漏洞
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之前版本存在访问控制错误漏洞，该漏洞源于删除转发主机时未进行管理员验证，可能导致任何经过身份验证的用户调用此API并严重破坏邮件服务。
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

Vendor Product Affected Versions CPE Subscribe
mailcow mailcow-dockerized < 2026-03b -

II. Public POCs for CVE-2026-40874

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III. Intelligence Information for CVE-2026-40874

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Vendor Advisories for CVE-2026-40874 (1)

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

CVE-2026-40871 7.2 HIGH mailcow: dockerized vulnerable to Second Order SQL Injection in quarantine category via AP
CVE-2026-40875 mailcow: dockerized vulnerable to stored XSS in user login history real_rip
CVE-2026-40872 mailcow: dockerized vulnerable to stored XSS in autodiscover logs email address field
CVE-2026-40873 mailcow: dockerized vulnerable to stored XSS in Quarantine attachment filenames
CVE-2026-40878 mailcow-dockerized Login Page has Reflected Parameter Injection / Wrong-Context XSS Escapi

IV. Related Vulnerabilities

Same product: mailcow-dockerized
Same vendor: mailcow
Same weakness: CWE-284

V. Comments for CVE-2026-40874

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