Svelte: XSS via DOM Clobbering of Internal Framework State
CVE-2026-42573

5.3MEDIUM

Key Information:

Vendor

Sveltejs

Status
Svelte
Vendor
CVE Published:
9 June 2026

What is CVE-2026-42573?

Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.

Affected Version(s)

svelte < 5.55.7

References

https://github.com/sveltejs/svelte/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/sveltejs/svelte/releases/tag/svelte%40...
x_refsource_MISC

CVSS V4

Score:
5.3
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

.