CVE-2026-27122

Description

svelte performance oriented web framework. Prior to 5.51.5, 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. This vulnerability is fixed in 5.51.5.

PUBLISHED Reserved 2026-02-17 | Published 2026-02-20 | Updated 2026-02-23 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

References

github.com/...svelte/security/advisories/GHSA-m56q-vw4c-c2cp

cve.org (CVE-2026-27122)

nvd.nist.gov (CVE-2026-27122)

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