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CVE-2026-81931— Unrestricted upload of file with dangerous type in Prospero Flow CRM product photo allows stored cross-site scripting

Quick assessment

Affected
Roskus Prospero Flow CRM
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 Roskus Prospero Flow CRM 5.16.0 之前的产品照片上传功能中，存在“危险类型文件无限制上传”的漏洞。 拥有“创建产品”权限的已认证用户（通常为常规 Seller 角色）可以在应用源站内执行任意 JavaScript。 具体而言，照片校验规则仅根据文件内容（魔术字节/magic bytes）进行分类，且只拒绝固定的 PHP 扩展名列表；而 在保存文件时，直接使用客户端提供的扩展名作为存储文件名，并将文件复制到公共 Web 根目录。 如果一个文件以图像文件头开头，但携带 HTML 扩展名

CVSS 4.8 · Medium
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I. Basic Information for CVE-2026-81931

Vulnerability Information
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Vulnerability Title
Unrestricted upload of file with dangerous type in Prospero Flow CRM product photo allows stored cross-site scripting
Source: CVE Program / CVE List V5
Vulnerability Description
Unrestricted Upload of File with Dangerous Type in the product photo upload in Roskus Prospero Flow CRM before 5.16.0 allows an authenticated user holding the create product permission (routine Seller role) to execute arbitrary JavaScript in the application origin. The photo validation rule classifies the file only by its content (magic bytes) and rejects only a fixed list of PHP extensions, while ProductSaveController::save() names the stored file using the client-supplied extension and copies it into the public web root. A file that begins with an image header and carries an HTML extension passes validation, is stored under public/asset/upload/product/, and is served with a text/html content type, turning the upload into first-party stored script execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Roskus Prospero Flow CRM 0 ~ 5.16.0 cpe:2.3:a:roskus:prospero_flow_crm:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-81931

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III. Intelligence Information for CVE-2026-81931

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Patches & Fixes for CVE-2026-81931 (1)

Vendor Advisories for CVE-2026-81931 (1)

IV. Related Vulnerabilities

Same product: Prospero Flow CRM
Same vendor: Roskus
Same weakness: CWE-434

V. Comments for CVE-2026-81931

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