Eclipse: >> Open Vsx >> 0.9.0 Security Vulnerabilities
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.
CVSS Score
4.1
EPSS Score
0.002
Published
2026-07-01
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.
CVSS Score
4.1
EPSS Score
0.002
Published
2026-06-23
In OpenVSX version v0.9.0 to v0.20.0, the
/user/namespace/{namespace}/details API allows a user to edit all
namespace details, even if the user is not a namespace Owner or
Contributor. The details include: name, description, website, support
link and social media links. The same issues existed in
/user/namespace/{namespace}/details/logo and allowed a user to change
the logo.
CVSS Score
6.9
EPSS Score
0.005
Published
2025-02-19