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CVE-2026-27902 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.4 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9	[email protected]	Patch
https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5	[email protected]	Release Notes
https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	[email protected]

Affected Products

Product	Versions
svelte svelte	>= 5.53.0, < 5.53.5
CPE cpe:2.3:a:svelte:svelte::::::node.js::* Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Mar 5, 2026	Initial Analysis	[email protected]
Feb 26, 2026	New CVE Received	[email protected]