CVE-2025-11966Public exploitNetwork attack vector

Stored XSS via unescaped directory-listing filenames

Published Oct 22, 2025 · Updated Oct 22, 2025

Stored XSS in Eclipse Foundation Vert.x 4.0.0 through 4.5.21 and 5.0.0 through 5.0.4 allows attackers to execute script via filenames. StaticHandlerImpl.sendDirectoryListing inserts file and directory names into link href, title, and body contexts without HTML escaping. Directory listing must be enabled, the attacker must control a name in the served path, and the script executes when the listing is viewed.

CVSS severity2.3
Low
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Eclipse Foundation Vert.x 4.0.0 through 4.5.21 and 5.0.0 through 5.0.4 allows attackers to execute script via filenames. StaticHandlerImpl.sendDirectoryListing inserts file and directory names into link href, title, and body contexts without HTML escaping. Directory listing must be enabled, the attacker must control a name in the served path, and the script executes when the listing is viewed.

The record

CVE
CVE-2025-11966
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
The Eclipse Foundation
Product
Vert.x
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.0 <4.5.22
  2. Affected versionversion=5.0.0 <5.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Eclipse Foundation · Vert.xversion=4.0.0 <4.5.22; version=5.0.0 <5.0.5

Published CVSS scores

2.3Eclipse FoundationCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
6.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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