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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (19.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Eclipse Vert.x
- Eclipse Foundation Vert.x — versions 4.0.0, 5.0.0
Weakness classification (CWE)
References
- gitlab.eclipse.org/security/vulnerability-reports/-/issues/303 (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.