HTML Injection Vulnerability in Svelte Framework by SvelteJS
CVE-2026-27119

5.1MEDIUM

Key Information:

Vendor

Sveltejs

Status
Svelte
Vendor
CVE Published:
20 February 2026

What is CVE-2026-27119?

A security issue exists within the Svelte framework where the server-side rendering output of certain elements does not adequately escape their content. This flaw can result in HTML injection vulnerabilities, which may lead to unauthorized content manipulation or attack vectors under specific circumstances. Client-side rendering is unaffected. The issue has been addressed in version 5.51.5.

Affected Version(s)

svelte >= 5.39.3, < 5.51.5

References

https://github.com/sveltejs/svelte/security/advisories/GH...
x_refsource_CONFIRM

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.