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CVE-2026-30934— FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)

Quick assessment

Affected
gtsteffaniak filebrowser
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.

FileBrowser Quantum是Graham Steffaniak个人开发者的一个文件管理器。 FileBrowser Quantum 1.3.1-beta之前版本和1.2.2-stable之前版本存在跨站脚本漏洞，该漏洞源于共享元数据字段渲染时未使用上下文感知转义，可能导致存储型跨站脚本攻击。

CVSS 8.9 · High EPSS 0.36% · P28
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I. Basic Information for CVE-2026-30934

Vulnerability Information
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Vulnerability Title
FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)
Source: CVE Program / CVE List V5
Vulnerability Description
FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-beta and 1.2.2-stable, Stored XSS is possible via share metadata fields (e.g., title, description) that are rendered into HTML for /public/share/<hash> without context-aware escaping. The server uses text/template instead of html/template, allowing injected scripts to execute when victims visit the share URL. This vulnerability is fixed in 1.3.1-beta and 1.2.2-stable.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
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
Vulnerability Title
FileBrowser Quantum 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FileBrowser Quantum是Graham Steffaniak个人开发者的一个文件管理器。 FileBrowser Quantum 1.3.1-beta之前版本和1.2.2-stable之前版本存在跨站脚本漏洞，该漏洞源于共享元数据字段渲染时未使用上下文感知转义，可能导致存储型跨站脚本攻击。
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
gtsteffaniak filebrowser >= 1.3.0-beta, < 1.3.1-beta -

II. Public POCs for CVE-2026-30934

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8554 chars
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III. Intelligence Information for CVE-2026-30934

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Vendor Advisories for CVE-2026-30934 (1)

Vendor Pages for CVE-2026-30934 (2)

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: gtsteffaniak
Same weakness: CWE-79

V. Comments for CVE-2026-30934

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