CVE-2017-16015 is a medium-severity (CVSS 6.1) CWE-80 vulnerability in forms. A fix is available for forms — see the affected versions and patch details below.
Cross-Site Scripting in forms
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2017-16015 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
formsnpmDescription
Forms is a library for easily creating HTML forms. Versions before 1.3.0 did not have proper html escaping. This means that if the application did not sanitize html on behalf of forms, use of forms may be vulnerable to cross site scripting
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | forms | all versions | 1.3.0npm install forms@1.3.0 |
Affected Products
formsforms_projectDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for forms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update forms to 1.3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-16015 is resolved across your whole dependency graph.
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
Is CVE-2017-16015 in your dependencies?
Find it across npm, including transitive dependencies.