CVE-2026-27119CWE-79

Svelte affected by XSS in SSR `<option>` element

Medium · published February 20, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
14.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N
EPSS
0.00243 · 14.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-02-20T22:25Z
EPSS history
Timeline
  • 20 FEB 22:25Z
    Svelte affected by XSS in SSR `<option>` element
    cvelistv5