CVE-2026-13323

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.

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Produits concernés

• Eclipse Foundation Eclipse Open VSX
• Eclipse open vsx

Scores CVSS

Faiblesses (CWE)

• CWE-79

Références

• https://github.com/eclipse-openvsx/openvsx/pull/1922 Issue TrackingPatch
• https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485 ExploitIssue TrackingVendor Advisory
• https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485 ExploitIssue TrackingVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories