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MEDIUM severity

Cross-site Scripting in vis-timelineGHSA-9mrv-456v-pf22

MEDIUMFix: visjs/vis-timeline#840

GHSA-9mrv-456v-pf22 is a medium-severity (CVSS 6.8) Cross-site Scripting (XSS) vulnerability in vis-timeline. 3 public exploit references exist, so weaponization risk is real. A fix is available for vis-timeline — see the affected versions and patch details below.

Also known asCVE-2020-28487
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
3 known
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs73th percentile — riskier than 73% of all scored CVEsHighest risk
0.02%0.66%1.30%1.94%0.5%1.4%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-9mrv-456v-pf22 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 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.

69other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
vis-timelinenpm
251Kdownloads / week

Description

This affects the package vis-timeline before 7.4.4. An attacker with the ability to control the items of a Timeline element can inject additional script code into the generated application.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmvis-timelineall versions7.4.4npm install vis-timeline@7.4.4

Affected Products

1 product · 1 configurations
Application
vis-timelinevisjs
< 7.4.4
range
Exploits & PoCs
3

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

This affects the package vis-timeline before 7.4.4. An attacker with the…

snyk.ioNVDFeb 2021

This affects the package vis-timeline before 7.4.4. An attacker with the…

snyk.ioNVDFeb 2021

This affects the package vis-timeline before 7.4.4. An attacker with the…

snyk.ioNVDFeb 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update vis-timeline to 7.4.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9mrv-456v-pf22 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

This affects the package vis-timeline before 7.4.4. An attacker with the ability to control the items of a Timeline element can inject additional script code into the generated application.
O3 Security · Impact-Aware SCA

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