CVE-2026-27902

EUVD-2026-8800
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.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.4 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
sveltesvelte
5.53.0 ≤
𝑥
< 5.53.5
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9
https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5
https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3