CVE-2026-27902

MEDIUM

5.4

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.

CVE Details

CVSS v3.1 Score5.4

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published2/26/2026

Last Modified3/5/2026

Sourcenvd

Honeypot Sightings0

Affected Products

svelte:svelte

Weaknesses (CWE)

CWE-79

References

https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9(security-advisories@github.com)

https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5(security-advisories@github.com)

https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3(security-advisories@github.com)

IOC Correlations

No correlations recorded

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