CVE-2026-27902

Summary

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.

Impact & exploitability

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

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9 ↗

Additional information

• NVD record
• https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9Patch
• https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3Advisory
• https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5