XSS in Eclipse Foundation Open Vsx
CVE-2026-4983
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…
Vulnerability class: XSS (Cross-Site Scripting)
CVSS v3 metric
CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N.
Affected products
- Eclipse Foundation Open Vsx — versions 0.1.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-4983?
- CVE-2026-4983 is a medium-severity vulnerability in Eclipse Foundation Open Vsx, classified under Cross-site Scripting. CVSS score: 4.1/10. Published 2026-06-23.
- How severe is CVE-2026-4983?
- Medium severity. CVSS v3 base score is 4.1 out of 10.