PT-2026-20873 · Npm · Svelte

Published 2026-02-19 · Updated 2026-02-19

OSV

CVSS v4.0

5.1

Medium

Base vector

AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N

When using <svelte:element this={tag}> in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

GHSA-M56Q-VW4C-C2CP

Affected Products

Svelte

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-27122 · Security Note
• https://osv.dev/vulnerability/GHSA-m56q-vw4c-c2cp · Vendor Advisory
• https://github.com/sveltejs/svelte · Note
• https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp · Note