Skip to content
Fencer Vulns
medium 6.4

CVE-2025-11966 json

Vert.x-Web vulnerable to Stored Cross-site Scripting in directory listings via file names

published 2025-10-22 12 mo ago modified 2026-10-08 32 d ago also EUVD-2025-35364 , GHSA-45p5-v273-3qqr

cvss
6.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven io.vertx:vertx-web 4.5.22, 5.0.5
  • Eclipse Foundation Vert.x 4.5.22, 5.0.5

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-11966 updated cvss 4.9

io.vertx/vertx-web: Eclipse Vert.x cross site scripting

  • Red Hat Cryostat 4 vertx-web, vertx-web-client, vertx-web-common Red Hat OpenShift Serverless openshift-serverless-1/kn-ekb-receiver-rhel8, openshift-serverless-1/kn-ekb-dispatcher-rhel8, openshift-serverless-1/kn-eventing-integrations-log-sink-rhel8, openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel8, openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel8, openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel8, +4 more Red Hat build of Apache Camel - HawtIO 4 vertx-web, vertx-web-client, vertx-web-common Red Hat build of Apache Camel 4 for Quarkus 3 vertx-web, vertx-web-client, vertx-web-common Red Hat build of Apache Camel for Spring Boot 4 vertx-web, vertx-web-client, vertx-web-common Red Hat build of Apicurio Registry 2 vertx-web, vertx-web-client, vertx-web-common
    +6 more products
    Red Hat build of Apicurio Registry 3 vertx-web, vertx-web-client, vertx-web-common Red Hat build of Debezium 2 vertx-web, vertx-web-client, vertx-web-common Red Hat build of Debezium 3 vertx-web, vertx-web-client, vertx-web-common Red Hat build of OptaPlanner 8 vertx-web, vertx-web-common Red Hat build of Quarkus vertx-web-client, vertx-web-common Red Hat Data Grid 8 vertx-web, vertx-web-client, vertx-web-common
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Fuse 7 vertx-web, vertx-web-client, vertx-web-common
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat JBoss Enterprise Application Platform 7 vertx-web, vertx-web-client, vertx-web-common, vertx-web-graphql, vertx-web-openapi, vertx-web-templ-jade, +8 more Red Hat JBoss Enterprise Application Platform 8 vertx-web, vertx-web-proxy, vertx-web-client, vertx-web-common, vertx-web-parent, vertx-web-graphql, +19 more Red Hat JBoss Enterprise Application Platform Expansion Pack vertx-web, vertx-web-proxy, vertx-web-client, vertx-web-common, vertx-web-parent, vertx-web-graphql, +19 more Red Hat OpenShift AI (RHOAI) rhoai/odh-trustyai-service-rhel8, rhoai/odh-trustyai-service-rhel9 Red Hat OpenShift Dev Spaces devspaces/server-rhel9 Red Hat Process Automation 7 vertx-web, vertx-web-common
    +2 more products
    Red Hat streams for Apache Kafka 2 vertx-web, vertx-web-client, vertx-web-common, vertx-web-openapi, vertx-web-validation Red Hat streams for Apache Kafka 3 vertx-web-client, vertx-web-common, vertx-web-openapi, vertx-web-validation
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Quarkus 3.20.4.SP1
    fixed: vendor fix RHSA-2026:0131
  • Red Hat build of Quarkus 3.27.1.SP1
    fixed: vendor fix RHSA-2026:0134
  • Red Hat Streams for Apache Kafka 3.1.0
    fixed: vendor fix RHSA-2025:23417

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
12 mo ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.eclipse.org https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/303 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 2.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
GitHub 3.1 4.9 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
CNA 4.0 2.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 6.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven io.vertx:vertx-web
<4.5.22
>=5.0.0, <5.0.5
4.5.22
5.0.5

Affected products

  • Eclipse Foundation Vert.x

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
  • CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.