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2 vulnerabilities found for Eclipse Open VSX by Eclipse Foundation

CVE-2026-13323 (GCVE-0-2026-13323)

Vulnerability from cvelistv5 – Published: 2026-07-01 11:28 – Updated: 2026-07-01 12:19
VLAI?
Summary
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.
Severity ?
4.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
CWE
  • CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')
Assigner
References
Impacted products
Vendor Product Version
Eclipse Foundation Eclipse Open VSX Affected: 0.1.0 , < 1.0.2 (semver)
Create a notification for this product.
Credits
Golan Myers
Show details on NVD website
To clipboard 

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CVE-2026-4983 (GCVE-0-2026-4983)

Vulnerability from cvelistv5 – Published: 2026-06-23 10:50 – Updated: 2026-06-23 12:03
VLAI?
Summary
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.
Severity ?
4.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
CWE
  • CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')
Assigner
References
Impacted products
Vendor Product Version
Eclipse Foundation Eclipse Open VSX Affected: 0.1.0 , < 0.34.1 (semver)
Create a notification for this product.
Credits
Golan Myers
Show details on NVD website
To clipboard 

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