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CVE-2026-44259— efw4.X: Stored XSS via previewServlet

Quick assessment

Affected
efwGrp efw4.X
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.

EFW Framework是efw group开源的一个基于Ajax和服务端JavaScript的企业级Web开发框架。 EFW Framework 4.08.010之前版本存在安全漏洞，该漏洞源于previewServlet未进行内容清理或安全标头，可能导致跨站脚本攻击。

CVSS 4.6 · Medium EPSS 0.23% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
efwGrp efw4.X < 4.08.010 affected
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I. Basic Information for CVE-2026-44259

Vulnerability Information
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Vulnerability Title
efw4.X: Stored XSS via previewServlet
Source: CVE Program / CVE List V5
Vulnerability Description
efw4.X is an Enterprise Framework for Web. Prior to 4.08.010, the previewServlet serves files with their detected MIME type based on file extension, without any content sanitization or security headers. Files with .html, .htm, or .svg extensions are served as text/html or image/svg+xml respectively, causing any embedded JavaScript to execute in the victim's browser within the application's origin. This vulnerability is fixed in 4.08.010.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A: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
EFW Framework 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
EFW Framework是efw group开源的一个基于Ajax和服务端JavaScript的企业级Web开发框架。 EFW Framework 4.08.010之前版本存在安全漏洞，该漏洞源于previewServlet未进行内容清理或安全标头，可能导致跨站脚本攻击。
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
efwGrp efw4.X < 4.08.010 -

II. Public POCs for CVE-2026-44259

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III. Intelligence Information for CVE-2026-44259

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Vendor Advisories for CVE-2026-44259 (1)

Same Patch Batch · efwGrp · 2026-05-12 · 4 CVEs total

CVE-2026-44260 8.1 HIGH efw4.X: readonly Flag Not Enforced Server-Side
CVE-2026-44257 efw4.X: RCE via zipslip
CVE-2026-44258 efw4.X: Path Traversal via Unchecked dst Parameter leads to Remote Code Execution

IV. Related Vulnerabilities

Same product: efw4.X
Same vendor: efwGrp
Same weakness: CWE-80