What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-12 · updated 2026-10-26
• Weakness: CWE-80

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.

Affected products

• efwGrp efw4.X: before 4.08.010

References

• https://github.com/efwGrp/efw4.X/security/advisories/GHSA-hw67-p3gw-rrmj
• https://github.com/efwGrp/efw4.X/security/advisories/GHSA-hw67-p3gw-rrmj

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