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MEDIUM severity

Cross-site scripting (XSS) in Apache Velocity ToolsGHSA-fh63-4r66-jc7v

MEDIUM

GHSA-fh63-4r66-jc7v is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.apache.velocity.tools:velocity-tools-parent. A fix is available for org.apache.velocity.tools:velocity-tools-parent — see the affected versions and patch details below.

Also known asCVE-2020-13959
Published
Updated
Affected
2 pkgs
Patched
1 / 2
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
5.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs93th percentile — riskier than 93% of all scored CVEsHighest risk
2.26%3.94%5.62%7.30%3.2%5.7%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-fh63-4r66-jc7v by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected
☕org.apache.velocity.tools:velocity-tools-parent☕org.apache.velocity:velocity-tools

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

The default error page for VelocityView in Apache Velocity Tools prior to 3.1 reflects back the vm file that was entered as part of the URL. An attacker can set an XSS payload file as this vm file in the URL which results in this payload being executed. XSS vulnerabilities allow attackers to execute arbitrary JavaScript in the context of the attacked website and the attacked user. This can be abused to steal session cookies, perform requests in the name of the victim or for phishing attacks.

Affected Packages

2 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.velocity.tools:velocity-tools-parentall versions3.1org.apache.velocity.tools:velocity-tools-parent:3.1
☕Mavenorg.apache.velocity:velocity-toolsall versionsNo fix

Affected Products

2 products · 2 configurations
Application
velocity toolsapache
< 3.1
range
OS
debian linuxdebian
1 version
9.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.velocity.tools:velocity-tools-parent, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.velocity.tools:velocity-tools-parent to 3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-fh63-4r66-jc7v is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

The default error page for VelocityView in Apache Velocity Tools prior to 3.1 reflects back the vm file that was entered as part of the URL. An attacker can set an XSS payload file as this vm file in the URL which results in this payload being executed. XSS vulnerabilities allow attackers to execute arbitrary JavaScript in the context of the attacked website and the attacked user. This can be abused to steal session cookies, perform requests in the name of the victim or for phishing attacks.
O3 Security · Impact-Aware SCA

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Cross-site scripting (XSS) in Apache Velocity Tools