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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-27902

Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

sveltejs svelte

  • >= 5.53.0, < 5.53.5affected

References