CVE-2026-27121

MEDIUM

5.4

Description

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.

Details CVE

Score CVSS v3.15.4

SeveriteMEDIUM

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisLOW

Interaction utilisateurREQUIRED

Publie2/20/2026

Derniere modification2/23/2026

Sourcenvd

Observations honeypot0

Produits affectes

svelte:svelte

Faiblesses (CWE)

CWE-79

References

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

Correlations IOC

Aucune correlation enregistree

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