Open VSX Registry Vulnerability Allows Stored XSS and Session Hijacking
Open VSX Registry Vulnerability Allows Stored XSS and Session Hijacking
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, allowing 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.
What the vulnerability/exploit is about
Open VSX
Polish
Arabic
French
Spanish
Portuguese
Deutsch
Turkish
Dutch
Italiano
Russian
Romaian
Portuguese (Brazil)
Greek
Chinese (Simplified)
Chinese (Traditional)
Japanese
Korean
Hindi
Vietnamese
Polish
Swedish
Ukrainian
Hebrew
Thai
Indonesian
Bengali
Urdu
Persian
Tamil
Danish
Finnish
Norwegian
Czech
Hungarian
Bulgarian
Slovak
Slovenian
Lithuanian
Latvian
Estonian
Croatian
Serbian
Malay