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CVE-2026-104083— SmarterMail < Build 9777 Stored Mutation XSS via MathML Foreign Content

Quick assessment

Affected
Smartertools Smartermail
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.

在构建版本低于 9777 的 SmarterMail 中，存在一个存储型变异型跨站脚本（XSS）漏洞。该漏洞允许远程攻击者通过在 元素内注入恶意脚本载荷，并利用嵌套在 MathML 外部内容中的结构（即 ）来实施攻击。SmarterMail 自定义的 HTML 清洗器将此类内容误认为是惰性 CDATA 文本，而浏览器则会将其重新解析为可执行的标记（live markup），从而导致脚本执行。 攻击者可以构造一个包含恶意 载荷的日历（iCal）消息，并通过电子邮件发送给受害者。当收件人在 路径下使用 Webmail

CVSS 6.1 · Medium
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I. Basic Information for CVE-2026-104083

Vulnerability Information
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Vulnerability Title
SmarterMail < Build 9777 Stored Mutation XSS via MathML Foreign Content
Source: CVE Program / CVE List V5
Vulnerability Description
SmarterMail before build 9777 contains a stored mutation cross-site scripting vulnerability that allows remote attackers to inject executable script by placing payloads inside a <style> element nested within MathML foreign content (<math><mtext><mglyph>), which the custom HTML sanitizer treats as inert CDATA text but browsers reparse as live markup. Attackers can deliver a crafted calendar (iCal) message containing an <img src=x onerror=...> payload that executes automatically in the recipient's webmail session at /interface/message-iframe when the message is opened, enabling script execution and data exfiltration unconstrained by the interface's permissive Content-Security-Policy.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Smartertools Smartermail 0 ~ Build 9777 -

II. Public POCs for CVE-2026-104083

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III. Intelligence Information for CVE-2026-104083

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Other References for CVE-2026-104083 (2)

Same Patch Batch · Smartertools · 2026-10-09 · 3 CVEs total

CVE-2026-104084 8.8 HIGH SmarterMail < Build 9777 Stale JWT Role Claim Privilege Escalation via Refresh Token
CVE-2026-104082 7.2 HIGH SmarterMail < Build 9777 SysAdmin Remote Code Execution via Volume Mount

IV. Related Vulnerabilities

Same product: Smartermail
Same vendor: Smartertools
Same weakness: CWE-79

V. Comments for CVE-2026-104083

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