CVE-2026-42599

6.1 MEDIUM

Svelte is a performance oriented web framework

Published: 2026-06-09 · Last updated: 2026-06-11

Severity and scoring

CVSS: 6.1 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE: CWE-79

Affected products

Vendor	Product
svelte	svelte

Description

Svelte is a performance oriented web framework. Prior to version 5.55.7, 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. Note that this vulnerability only triggers if the user's browser has JavaScript enabled but Svelte's hydration mechanism does not reach the vulnerable element before the event fires. This issue has been patched in version 5.55.7.

Source: NVD

References

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CVE-2026-42567 — Svelte is a performance oriented web framework (7.5 HIGH)

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