CVE-2026-27122 — Svelte SSR does not validate dynamic element tag names in `<svelte:element>`
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 …
Published: 2026-02-20 · CVSS: 5.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7