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CVE-2025-32391— HedgeDoc allows XSS possibility through malicious SVG uploads

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 1.10.3之前版本存在跨站脚本漏洞，该漏洞源于恶意SVG文件可能导致跨站脚本攻击。

CVSS 6.4 · Medium EPSS 0.31% · P23
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I. Basic Information for CVE-2025-32391

Vulnerability Information
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Vulnerability Title
HedgeDoc allows XSS possibility through malicious SVG uploads
Source: CVE Program / CVE List V5
Vulnerability Description
HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to 1.10.3, a malicious SVG file uploaded to HedgeDoc results in the possibility of XSS when opened in a new tab instead of the editor itself. The XSS is possible by exploiting the JSONP capabilities of GitHub Gist embeddings. Only instances with the local filesystem upload backend or special configurations, where the uploads are served from the same domain as HedgeDoc, are vulnerable. This vulnerability is fixed in 1.10.3. When upgrading to HedgeDoc 1.10.3 is not possible, instance owners could add the following headers for all routes under /uploads as a first-countermeasure: Content-Disposition: attachment and Content-Security-Policy: default-src 'none'. Additionally, the external URLs in the script-src attribute of the Content-Security-Policy header should be removed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/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 1.10.3之前版本存在跨站脚本漏洞，该漏洞源于恶意SVG文件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
hedgedoc hedgedoc < 1.10.3 -

II. Public POCs for CVE-2025-32391

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III. Intelligence Information for CVE-2025-32391

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IV. Related Vulnerabilities

Same product: hedgedoc
Same vendor: hedgedoc
Same weakness: CWE-79

V. Comments for CVE-2025-32391

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