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CVE-2026-59239— Stored XSS in Prospero Flow CRM email body allows administrator account takeover

Quick assessment

Affected
Roskus Prospero Flow CRM
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是对该漏洞描述信息的中文翻译： Roskus Prospero Flow CRM 5.4.4 版本之前的邮件模块中存在存储型跨站脚本漏洞（CWE-79），允许远程的低权限认证用户在另一个用户的浏览器中执行任意 JavaScript 代码，包括针对管理员的攻击。攻击者可通过将恶意载荷嵌入电子邮件正文，并持久化存储且未进行消毒处理，当收件人打开邮件时，该载荷以 {!! $email->body !!} 的形式被未转义地渲染，从而导致会话被劫持和账户接管。

CVSS 8.6 · High EPSS 0.67% · P50

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
Roskus Prospero Flow CRM 1.0.0< 5.4.4 affected
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I. Basic Information for CVE-2026-59239

Vulnerability Information
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Vulnerability Title
Stored XSS in Prospero Flow CRM email body allows administrator account takeover
Source: CVE Program / CVE List V5
Vulnerability Description
Stored Cross-site Scripting (CWE-79) in the email module in Roskus Prospero Flow CRM before 5.4.4 allows a remote, authenticated low-privileged user to execute arbitrary JavaScript in another user's browser, including administrators, leading to session compromise and account takeover, via a payload stored in an email body that is persisted without sanitization and rendered unescaped with {!! $email->body !!} when the recipient opens the message.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Roskus Prospero Flow CRM 1.0.0 ~ 5.4.4 -

II. Public POCs for CVE-2026-59239

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5982 chars
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III. Intelligence Information for CVE-2026-59239

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Patches & Fixes for CVE-2026-59239 (1)

Vendor Advisories for CVE-2026-59239 (1)

Other References for CVE-2026-59239 (1)

IV. Related Vulnerabilities

Same product: Prospero Flow CRM
Same vendor: Roskus
Same weakness: CWE-79

V. Comments for CVE-2026-59239

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