CVE-2026-30974— Copyparty volflag `nohtml` did not block javascript in svg files
Quick assessment
Affected
9001 copyparty
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.
Copyparty是ed个人开发者的一个便携式文件服务器。 Copyparty v1.20.11之前版本存在跨站脚本漏洞，该漏洞源于nohtml配置选项未应用于SVG图像，可能导致上传包含嵌入式JavaScript的SVG文件并在用户打开时执行。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-30974
Vulnerability Information
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Vulnerability Title
Copyparty volflag `nohtml` did not block javascript in svg files
Source: CVE Program / CVE List V5
Vulnerability Description
Copyparty is a portable file server. Prior to v1.20.11., the nohtml config option, intended to prevent execution of JavaScript in user-uploaded HTML files, did not apply to SVG images. A user with write-permission could upload an SVG containing embedded JavaScript, which would execute in the context of whichever user opens it. This has been fixed in v1.20.11.
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
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
Copyparty 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Copyparty是ed个人开发者的一个便携式文件服务器。 Copyparty v1.20.11之前版本存在跨站脚本漏洞，该漏洞源于nohtml配置选项未应用于SVG图像，可能导致上传包含嵌入式JavaScript的SVG文件并在用户打开时执行。
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-2026-30974
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2026-30974 (1)
Vendor Advisories for CVE-2026-30974 (1)
Other References for CVE-2026-30974 (1)
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Release what? nohtml is evolving! · 9001/copyparty · GitHub x_refsource_MISC
IV. Related Vulnerabilities
Same product: copyparty
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CVE-2026-93353
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CVE-2026-70657
Copyparty: file/dirkey confusion -
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Copyparty has unexpected JavaScript execution via crafted UR -
CVE-2026-32108
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CVE-2026-27948
Copyparty vulnerable to eflected cross-site scripting via se
Same vendor: 9001
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CVE-2026-93353
copyparty SFTP Volume Restriction Bypass via mkdir/rmdir/cha -
CVE-2026-70657
Copyparty: file/dirkey confusion -
CVE-2026-32109
Copyparty has unexpected JavaScript execution via crafted UR -
CVE-2026-32108
Copyparty ftp/sftp: Sharing a single file did not fully rest -
CVE-2026-27948
Copyparty vulnerable to eflected cross-site scripting via se
Same weakness: CWE-79
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V. Comments for CVE-2026-30974
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