What is CVE-2025-11966?

CVE-2025-11966 is a medium-severity vulnerability in Eclipse Vert.x, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2025-10-22.

How severe is CVE-2025-11966?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Eclipse Vert.x

CVE-2025-11966

In Eclipse Vert.x versions [4.0.0, 4.5.21] and [5.0.0, 5.0.4], when "directory listing" is enabled, file and directory names are inserted into generated HTML without proper escaping in the href, title, and link attributes. An attacker who can create or rename files or directories within a served path can craft filenames containing malicious script or HTML content, leading to stored cross-site scripting (XSS) that executes in the context of users viewing the affected directory listing.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (19.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Eclipse Vert.x
Eclipse Foundation Vert.x — versions 4.0.0, 5.0.0

Weakness classification (CWE)

References

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

Frequently asked questions

What is CVE-2025-11966?: CVE-2025-11966 is a medium-severity vulnerability in Eclipse Vert.x, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2025-10-22.
How severe is CVE-2025-11966?: Medium severity. CVSS v3 base score is 6.4 out of 10.