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CVE-2026-13323

Quick assessment

Affected
Eclipse Foundation Eclipse Open VSX
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.

Eclipse Foundation Eclipse Open VSX是Eclipse Foundation基金会的一款扩展市场平台。 Eclipse Foundation Eclipse Open VSX 1.0.2之前版本存在跨站脚本漏洞，该漏洞源于端点服务于用户提供的HTML文件，未设置Content-Security-Policy或Content-Disposition响应头，可能导致攻击者注册发布者账户、上传含特制HTML有效载荷的VSIX，诱导用户访问URL后导致会话令牌泄露、持久性个人访问令

CVSS 4.1 · Medium EPSS 0.33% · P24

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eclipse Foundation Eclipse Open VSX 0.1.0< 1.0.2 affected
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I. Basic Information for CVE-2026-13323

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a Content-Security-Policy or Content-Disposition: attachment response header. An unauthenticated attacker can register a publisher account, upload a VSIX containing a crafted HTML payload, and induce an authenticated user to visit the resulting URL. The browser renders the file inline in the open-vsx.org origin context, enabling session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions. Because Open VSX extensions are distributed to VS Code, VSCodium, Cursor, Windsurf, and compatible editors, a compromised extension update constitutes a supply chain attack against all downstream users.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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
Eclipse Foundation Eclipse Open VSX 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eclipse Foundation Eclipse Open VSX是Eclipse Foundation基金会的一款扩展市场平台。 Eclipse Foundation Eclipse Open VSX 1.0.2之前版本存在跨站脚本漏洞，该漏洞源于端点服务于用户提供的HTML文件，未设置Content-Security-Policy或Content-Disposition响应头，可能导致攻击者注册发布者账户、上传含特制HTML有效载荷的VSIX，诱导用户访问URL后导致会话令牌泄露、持久性个人访问令
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
Eclipse Foundation Eclipse Open VSX 0.1.0 ~ 1.0.2 -

II. Public POCs for CVE-2026-13323

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III. Intelligence Information for CVE-2026-13323

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Patches & Fixes for CVE-2026-13323 (1)

Vendor Advisories for CVE-2026-13323 (1)

IV. Related Vulnerabilities

Same product: Eclipse Open VSX
Same vendor: Eclipse Foundation
Same weakness: CWE-79

V. Comments for CVE-2026-13323

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