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MEDIUM severity

@lumieducation/h5p-server Fails to Sanitize Plain Text StringsGHSA-m7gm-v253-56hh

MEDIUMFix: Lumieducation/H5P-Nodejs-library#3894

GHSA-m7gm-v253-56hh is a medium-severity (CVSS 6.4) Cross-site Scripting (XSS) vulnerability in @lumieducation/h5p-server. A fix is available for @lumieducation/h5p-server — see the affected versions and patch details below.

Also known asCVE-2025-47828
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-m7gm-v253-56hh.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs24th percentile — riskier than 24% of all scored CVEsHighest risk
0.00%0.27%0.54%0.81%0.2%0.3%May 26Sep 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

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.

12other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@lumieducation/h5p-servernpm
18Kdownloads / week

Description

Lumi H5P-Nodejs-library before 9.3.3 omits a sanitizeHtml call for plain text strings.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npm@lumieducation/h5p-serverall versions9.3.3npm install @lumieducation/h5p-server@9.3.3

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @lumieducation/h5p-server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @lumieducation/h5p-server to 9.3.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-m7gm-v253-56hh 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

Lumi H5P-Nodejs-library before 9.3.3 omits a sanitizeHtml call for plain text strings.
O3 Security · Impact-Aware SCA

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