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Svelte SSR does not validate dynamic element tag names in `<svelte:element>`

CVSS 4.0 5.1 MEDIUMEUVD CVSS 4.0 5.1 CVSS 4.0 · [email protected] · Secondary 5.1 MEDIUMCVSS 3.1 · [email protected] · Primary 5.4 MEDIUMCVSS_V4 Publisher rating MODERATEFixed by svelte 5.51.5KEV status unknown

cve-program · CVE-2026-27122

Published

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.

Read the publisher's advisory

euvd · EUVD-2026-7538

Published

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.

Read the publisher's advisory

nvd · CVE-2026-27122

Published

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.

Read the publisher's advisory

osv · GHSA-m56q-vw4c-c2cp

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

Compare earlier KEV listings and daily EPSS scores. Advisory wording and affected versions have a separate history.

When does an EPSS score appear as a change?

A prediction change is reported when EPSS rises from below 10% to 10% or higher. Other daily score changes remain in this history.

Advisory history

13 saved versions

See how the publisher's advisory changed over time. Each link opens the version saved at that time. The publisher's update date can differ from the date shown here.

How advisory history works

Each link identifies one complete publisher record. History can include advisories that previously shared an identifier; an identifier removed by a publisher no longer establishes a current relationship. A historical link shows only that record and earlier saved versions. Failed checks and unchanged reads do not create new versions.

15 Nov 2026 08:36:14 UTC

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 co…

euvd · EUVD-2026-7538 · Published

13 Nov 2026 08:15:20 UTC

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 co…

euvd · EUVD-2026-7538 · Published

11 Nov 2026 07:29:43 UTC

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 co…

euvd · EUVD-2026-7538 · Published

9 Nov 2026 07:07:20 UTC

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 co…

euvd · EUVD-2026-7538 · Published

7 Nov 2026 06:29:31 UTC

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 co…

euvd · EUVD-2026-7538 · Published

5 Nov 2026 05:58:21 UTC

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 co…

euvd · EUVD-2026-7538 · Published

3 Nov 2026 05:01:39 UTC

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 co…

euvd · EUVD-2026-7538 · Published

1 Nov 2026 04:07:13 UTC

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 co…

euvd · EUVD-2026-7538 · Published

30 Oct 2026 03:51:42 UTC

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 co…

euvd · EUVD-2026-7538 · Published

28 Oct 2026 02:55:22 UTC

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 co…

euvd · EUVD-2026-7538 · Published

25 Oct 2026 06:17:28 UTC

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 co…

nvd · CVE-2026-27122 · Published

24 Oct 2026 13:17:17 UTC

Svelte SSR does not validate dynamic element tag names in `<svelte:element>`

osv · GHSA-m56q-vw4c-c2cp · Published

23 Oct 2026 15:48:27 UTC

Svelte SSR does not validate dynamic element tag names in `<svelte:element>`

cve-program · CVE-2026-27122 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 15 Nov 12:11 UTC · 256 of 275 readable · 252 fully read · documentation 469/469 current