What is CVE-2026-4983?

CVE-2026-4983 is a medium-severity vulnerability in Eclipse 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.

XSS in Eclipse 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)

EPSS: 0.002 (13.2th percentile) — read the EPSS interpretation.

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 Open_vsx
Eclipse Foundation Open Vsx — versions 0.1.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

emo@eclipse.org (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-4983?: CVE-2026-4983 is a medium-severity vulnerability in Eclipse 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.