CVE-2026-27122

MEDIUM

5.4

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.

CVE Details

CVSS v3.1 Score5.4

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionREQUIRED

Published2/20/2026

Last Modified2/23/2026

Sourcenvd

Honeypot Sightings0

Affected Products

svelte:svelte

Weaknesses (CWE)

CWE-79

References

https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp(security-advisories@github.com)

IOC Correlations

No correlations recorded

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