What is GHSA-qgvg-pr8v-6rr3?

GHSA-qgvg-pr8v-6rr3 is a security advisory published by GitHub Security Advisories with Medium severity. Svelte: XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers

Which CVE IDs does GHSA-qgvg-pr8v-6rr3 cover?

GHSA-qgvg-pr8v-6rr3 covers the following CVE IDs: CVE-2026-27902. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-qgvg-pr8v-6rr3?

GHSA-qgvg-pr8v-6rr3 affects 1 product, including: npm/svelte:\u003e= 5.53.0, \u003c 5.53.5.

GHSA-qgvg-pr8v-6rr3Medium

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

Vendor

GitHub Security Advisories

Published

February 26, 2026

Last Modified

February 26, 2026

🔗 CVE IDs covered (1)

CVE-2026-27902 →

📋 Description

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.

🎯 Affected products1

npm/svelte:>= 5.53.0, < 5.53.5

🔗 References (5)

https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3
https://nvd.nist.gov/vuln/detail/CVE-2026-27902
https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9
https://github.com/sveltejs/svelte/releases/tag/[email protected]
https://github.com/advisories/GHSA-qgvg-pr8v-6rr3