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MEDIUM severity

Cross-Site Scripting in formsGHSA-vwjj-2852-3765

MEDIUMFix: caolan/forms@bc01e53

GHSA-vwjj-2852-3765 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.

Also known asCVE-2017-16015
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk-0.01%
Lower risk than most CVEs57th percentile — riskier than 57% of all scored CVEsHighest risk
0.00%0.45%0.90%1.35%0.2%0.2%0.8%0.8%May 26Jul 26Oct 26

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

How urgent is this, really

GHSA-vwjj-2852-3765 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

1 pkg affected

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.

26other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
formsnpm
2Kdownloads / week

Description

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

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmformsall versions1.3.0npm install forms@1.3.0

Affected Products

1 product · 1 configurations
Application
formsforms_project
< 1.3.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    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.

  2. Fix

    Update forms to 1.3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vwjj-2852-3765 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

Affected versions of `forms` do not properly escape HTML in generated forms, which may result in cross-site scripting. ## Recommendation Update to version 1.3.0 or later.
O3 Security · Impact-Aware SCA

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Cross-Site Scripting in forms (Medium 6.1)