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MEDIUM severity

Svelte vulnerable to XSS when using objects during server-side renderingGHSA-wv8q-r932-8hc7

MEDIUMFix: sveltejs/svelte#7530

GHSA-wv8q-r932-8hc7 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in svelte. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for svelte — see the affected versions and patch details below.

Also known asCVE-2022-25875SNYK-JS-SVELTE-2931080
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
2 known
Exploitation data as of Nov 4, 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
0.23%0.80%1.37%1.94%0.7%1.4%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.

2Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
sveltenpm
9.2Mdownloads / week

Description

The package svelte before 3.49.0 are vulnerable to Cross-site Scripting (XSS) due to improper input sanitization and to improper escape of attributes when using objects during SSR (Server-Side Rendering). Exploiting this vulnerability is possible via objects with a custom toString() function.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmsvelteall versions3.49.0npm install svelte@3.49.0

Affected Products

1 product · 1 configurations
Application
sveltesvelte
< 3.49.0
range
Exploits & PoCs
2

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

The package svelte before 3.49.0 are vulnerable to Cross-site Scripting …

snyk.ioNVDJul 2022

Report on github.com

github.comNVDJul 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update svelte to 3.49.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wv8q-r932-8hc7 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

The package svelte before 3.49.0 is vulnerable to Cross-site Scripting (XSS) due to improper input sanitization and to improper escape of attributes when using objects during SSR (Server-Side Rendering). Exploiting this vulnerability is possible via objects with a custom toString() function.
O3 Security · Impact-Aware SCA

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