CVE-2026-25642— HedgeDoc security headers for uploaded files were not working
Quick assessment
Affected
hedgedoc hedgedoc
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.
HedgeDoc是HedgeDoc团队的一个基于Javascript的Markdown文档实时编辑分享平台。 HedgeDoc 1.10.6之前版本存在跨站脚本漏洞，该漏洞源于/uploads/端点下的文件未使用更严格的安全策略，可能导致托管恶意交互式Web内容。
Possible ATT&CK Techniques 1 AI
T1505.003 · Web Shell
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I. Basic Information for CVE-2026-25642
Vulnerability Information
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Vulnerability Title
HedgeDoc security headers for uploaded files were not working
Source: CVE Program / CVE List V5
Vulnerability Description
HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to 1.10.6, files served below the /uploads/ endpoint did not use a more strict security-policy. This resulted in a too open Content-Security-Policy and furthermore opened the possibility to host malicious interactive web content (such as fake login forms) using SVG files. This vulnerability is fixed in 1.10.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A: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
Vulnerability Title
HedgeDoc 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HedgeDoc是HedgeDoc团队的一个基于Javascript的Markdown文档实时编辑分享平台。 HedgeDoc 1.10.6之前版本存在跨站脚本漏洞，该漏洞源于/uploads/端点下的文件未使用更严格的安全策略，可能导致托管恶意交互式Web内容。
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
II. Public POCs for CVE-2026-25642
| # | POC Description | Source Link | Shenlong Link |
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Vendor Advisories for CVE-2026-25642 (1)
IV. Related Vulnerabilities
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Same vendor: hedgedoc
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V. Comments for CVE-2026-25642
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