CVE-2026-27119
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
Product
Svelte
PublishedFeb 20, 2026
First seenFeb 20, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- svelte svelte5.51.5 or later
- svelte5.51.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| svelte svelte | 5.39.3 ≤ v < 5.51.5 | 5.51.5 |
| sveltenpm | 5.39.3 ≤ v < 5.51.5 | 5.51.5 |
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