What’s Vulnerable › Vulnerabilities
CVE-2026-27119: Svelte affected by XSS in SSR `<option>` element
- Severity: medium (CVSS 5.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-20 · updated 2026-06-17
- Weakness: CWE-79
Description
svelte performance oriented web framework. From 5.39.3, <=5.51.4, in certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Affected products
- sveltejs svelte: from 5.39.3 before 5.51.5 — fixed in 5.51.5
How to fix
Upgrade to a fixed version: sveltejs svelte 5.51.5. Check the vendor advisory for mitigations.
References
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