CVE-2026-27902
Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | sveltejs |
| Product | svelte |
| Published | Feb 26, 2026 |
| Last Updated | Feb 26, 2026 |
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Affected Versions
sveltejs / svelte
>= 5.53.0, < 5.53.5