CVE-2026-27121 — Svelte affected by cross-site scripting via spread attributes in Svelte SSR

CVE-2026-27121

Svelte affected by cross-site scripting via spread attributes in Svelte SSR PUBLISHED

Description (CNA)

svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. This vulnerability is fixed in 5.51.5.

Affected (CNA)

Vendor / product	Versions
sveltejs / svelte	affected < 5.51.5

CWE

CWE-79

References

https://github.com/sveltejs/svelte/security/advisories/GHSA-f7gr-6p89-r883

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.