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CVE-2026-113583— Cypht 2.0.0 through 2.12.2 Stored DOM XSS via externalResources.js

Quick assessment

Affected
cypht-org cypht
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.

Cypht Webmail 2.0.0 至 2.12.2 版本存在基于 DOM 的跨站脚本（XSS）漏洞。当启用 配置项时，远程攻击者可通过在 HTML 邮件的外部图片标签中构造恶意的 文本或 URL 值，执行任意 JavaScript 代码。攻击者可发送特制邮件，当受害者打开该邮件时， 脚本会使用经过解码的、源自邮件的值，通过 构建“被阻止的图片”提示，从而在受害者的已认证会话中触发脚本执行。攻击者可借此读取邮箱、发送邮件或修改账户设置。

CVSS 6.1 · Medium
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I. Basic Information for CVE-2026-113583

Vulnerability Information
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Vulnerability Title
Cypht 2.0.0 through 2.12.2 Stored DOM XSS via externalResources.js
Source: CVE Program / CVE List V5
Vulnerability Description
Cypht webmail 2.0.0 through 2.12.2 contains a DOM-based cross-site scripting vulnerability that allows remote attackers to execute arbitrary JavaScript by crafting malicious alt text or URL values in an HTML email's external image tag when ALLOW_EXTERNAL_IMAGE_SOURCES is enabled. Attackers can send a specially crafted email so that when the victim opens it, the externalResources.js code builds the blocked-image notice using innerHTML with decoded email-derived values, triggering script execution in the victim's authenticated session to read mailboxes, send email, or change settings.
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
cypht-org cypht 2.0.0 ~ 2.13.0 -

II. Public POCs for CVE-2026-113583

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-113583

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Patches & Fixes for CVE-2026-113583 (1)

Vendor Advisories for CVE-2026-113583 (1)

Vendor Pages for CVE-2026-113583 (1)

IV. Related Vulnerabilities

Same product: cypht
Same vendor: cypht-org
Same weakness: CWE-79

V. Comments for CVE-2026-113583

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