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CVE-2026-4983

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存在跨站脚本漏洞，该漏洞源于未在存储前清理上传为扩展图标的SVG文件，并且以Content-Type: image/svg+xml提供而无安全标头，可能导致攻击者发布带恶意SVG图标的扩展，用户直接导航至图标URL时实现存储型跨站脚本，从而引发会话劫持、身份验证令牌窃取和未授权扩展发布；对于外部存储部署

CVSS 4.1 · Medium EPSS 0.31% · P23

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eclipse Foundation Eclipse Open VSX 0.1.0< 0.34.1 affected
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I. Basic Information for CVE-2026-4983

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Open VSX Registry does not sanitize SVG files uploaded as extension icons prior to storage, and serves them with Content-Type: image/svg+xml without security headers such as Content-Security-Policy or Content-Disposition: attachment. This allows an attacker to publish an extension with a malicious SVG icon and achieve stored cross-site scripting (XSS) when a user navigates directly to the icon URL. On deployments using local storage, script execution occurs within the Open VSX application origin, enabling session hijacking, authentication token theft, and unauthorized extension publishing. On deployments backed by external storage (such as open-vsx.org with an S3-backed CDN), execution is confined to the storage origin, reducing impact but still permitting phishing attacks and credential harvesting through attacker-crafted pages.
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存在跨站脚本漏洞，该漏洞源于未在存储前清理上传为扩展图标的SVG文件，并且以Content-Type: image/svg+xml提供而无安全标头，可能导致攻击者发布带恶意SVG图标的扩展，用户直接导航至图标URL时实现存储型跨站脚本，从而引发会话劫持、身份验证令牌窃取和未授权扩展发布；对于外部存储部署
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 ~ 0.34.1 -

II. Public POCs for CVE-2026-4983

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III. Intelligence Information for CVE-2026-4983

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Other References for CVE-2026-4983 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-4983

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