PT-2026-21305 · Svelte · Svelte

Elliott-With-The-Longest-Name-On-Github · Published 2026-02-19 · Updated 2026-03-06 · CVE-2026-27119

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Svelte versions 5.39.3 through 5.51.4

Description Svelte is susceptible to a flaw where, under specific conditions, the server-side rendering of an <option> element fails to properly escape its content. This can lead to potential HTML injection within the server-side rendered output. Client-side rendering is not impacted by this issue.

Recommendations Update to version 5.51.5 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-27119

GHSA-H7H7-MM68-GMRC

Affected Products

Svelte

References · 8

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27119.json · Exploit
• https://github.com/sveltejs/svelte/security/advisories/GHSA-h7h7-mm68-gmrc · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27119 · Security Note
• https://osv.dev/vulnerability/GHSA-h7h7-mm68-gmrc · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-27119 · Vendor Advisory
• https://github.com/sveltejs/svelte · Note
• https://twitter.com/CVEnew/status/2024988716880810303 · Twitter Post
• https://twitter.com/enismaholli/status/2030051967058227266 · Twitter Post