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CVE-2026-75872— HTML Injection in MailerUp double opt-in verification email

Quick assessment

Affected
maalfer MailerUp
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.

Mario MailerUp是Mario个人开发者的一款邮件服务器软件。 Mario MailerUp 1.1.3之前版本存在跨站脚本漏洞，该漏洞源于公开订阅表单中first_name字段未转义插入到双重选择验证邮件中，可能导致未认证远程攻击者利用应用发送携带任意HTML的消息到攻击者选择的地址，并使用表单所有者配置的发件身份。

CVSS 6.9 · Medium EPSS 0.71% · P50

Affected Version Matrix 1

VendorProduct Version RangeStatus
maalfer MailerUp < 1.1.3 affected
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I. Basic Information for CVE-2026-75872

Vulnerability Information
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Vulnerability Title
HTML Injection in MailerUp double opt-in verification email
Source: CVE Program / CVE List V5
Vulnerability Description
HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of the subscription request, which is interpolated unescaped into the double opt-in verification email.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
Web页面中脚本相关HTML标签转义处理不恰当(基本跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Mario MailerUp 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mario MailerUp是Mario个人开发者的一款邮件服务器软件。 Mario MailerUp 1.1.3之前版本存在跨站脚本漏洞，该漏洞源于公开订阅表单中first_name字段未转义插入到双重选择验证邮件中，可能导致未认证远程攻击者利用应用发送携带任意HTML的消息到攻击者选择的地址，并使用表单所有者配置的发件身份。
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
maalfer MailerUp 0 ~ 1.1.3 -

II. Public POCs for CVE-2026-75872

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III. Intelligence Information for CVE-2026-75872

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Patches & Fixes for CVE-2026-75872 (1)

Vendor Advisories for CVE-2026-75872 (1)

Other References for CVE-2026-75872 (1)

IV. Related Vulnerabilities

Same product: MailerUp
Same vendor: maalfer
Same weakness: CWE-80

V. Comments for CVE-2026-75872

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