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CVE-2026-40875— mailcow: dockerized vulnerable to stored XSS in user login history real_rip

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之前版本存在安全漏洞，该漏洞源于用户仪表板登录历史中未对客户端IP进行HTML转义，且服务器信任X-Real-IP标头，可能导致攻击者注入HTML/JS，结合登录CSRF读取受害者邮件。

AI Predicted 5.4 Difficulty: Hard EPSS 0.29% · P20
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I. Basic Information for CVE-2026-40875

Vulnerability Information
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Vulnerability Title
mailcow: dockerized vulnerable to stored XSS in user login history real_rip
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, the user dashboard's "Seen successful connections" (login history) renders the client IP from login logs without HTML escaping. Because the server trusts the X-Real-IP header as the source IP for logging, an attacker can inject HTML/JS into this field. This Self-XSS can be exploited by a Login CSRF to force the victim into the attacker's account, and then read emails in a previous browser tab. 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:P/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
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，该漏洞源于用户仪表板登录历史中未对客户端IP进行HTML转义，且服务器信任X-Real-IP标头，可能导致攻击者注入HTML/JS，结合登录CSRF读取受害者邮件。
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-2026-40875

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III. Intelligence Information for CVE-2026-40875

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Vendor Advisories for CVE-2026-40875 (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-2026-40872 mailcow: dockerized vulnerable to stored XSS in autodiscover logs email address field
CVE-2026-40874 mailcow: dockerized missing authorization on Forwarding Hosts delete action
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-79

V. Comments for CVE-2026-40875

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