How severe is CVE-2025-11966?

CVE-2025-11966 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-11966 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-11966?

CVE-2025-11966 affects Eclipse Vert.x. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-11966?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-11966 have an EU (EUVD) identifier?

Yes. CVE-2025-11966 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35364.

When was CVE-2025-11966 published?

CVE-2025-11966 was published on 2025-10-22 and last updated on 2026-06-17.

CVE-2025-11966

CVE-2025-11966 is a medium-severity vulnerability in Eclipse Vert.x with a CVSS 3.x base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.4)
CVSS v4: 2.3
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-35364
Weakness: CWE-79
Affected product: Eclipse Vert.x
Published: 2025-10-22
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-11966?: CVE-2025-11966 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-11966 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-11966?: CVE-2025-11966 affects Eclipse Vert.x. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-11966?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-11966 have an EU (EUVD) identifier?: Yes. CVE-2025-11966 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35364.
When was CVE-2025-11966 published?: CVE-2025-11966 was published on 2025-10-22 and last updated on 2026-06-17.

References

https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/303

Affected products (1)

cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*

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