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CRITICAL severity

Cross-Site Scripting in scratch-svg-rendererGHSA-j977-g5vj-j27g

CRITICALFix: LLK/scratch-svg-renderer@9ebf575

GHSA-j977-g5vj-j27g is a critical-severity (CVSS 9.6) Cross-site Scripting (XSS) vulnerability in scratch-svg-renderer. 1 public exploit reference exists, so weaponization risk is real. A fix is available for scratch-svg-renderer — see the affected versions and patch details below.

Also known asCVE-2020-7750SNYK-JS-SCRATCHSVGRENDERER-1020497
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Sep 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
6.1%probability of exploitation in next 30 days
Lower Risk-0.02%
Lower risk than most CVEs93th percentile — riskier than 93% of all scored CVEsHighest risk
5.57%6.20%6.82%7.45%7.0%6.1%Apr 26Jul 26Sep 26

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

How urgent is this, really

GHSA-j977-g5vj-j27g 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

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.

53other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
scratch-svg-renderernpm
13Kdownloads / week

Description

This affects the package scratch-svg-renderer before 0.2.0-prerelease.20201019174008. The loadString function does not escape SVG properly, which can be used to inject arbitrary elements into the DOM via the _transformMeasurements function.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmscratch-svg-rendererall versions0.2.0-prerelease.20201019174008npm install scratch-svg-renderer@0.2.0-prerelease.20201019174008

Affected Products

1 product · 86 configurations
Application
scratch-svg-renderermit
2 versions
0.1.00.2.0
Exploits & PoCs
1

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

EDB-50079webappsmultiple

Scratch Desktop 3.17 - Remote Code Execution

by Stig Magnus Baugstø · Jul 2, 2021

Exploit-DB Source

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update scratch-svg-renderer to 0.2.0-prerelease.20201019174008 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-j977-g5vj-j27g 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 scratch-svg-renderer before 0.2.0-prerelease.20201019174008. The loadString function does not escape SVG properly, which can be used to inject arbitrary elements into the DOM via the _transformMeasurements function.
O3 Security · Impact-Aware SCA

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Cross-Site Scripting in scratch-svg-renderer (Critical 9.6)