CVE-2026-27902

MEDIUM
2026-02-26 [email protected] GHSA-qgvg-pr8v-6rr3
5.4
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
Patch Released
Mar 05, 2026 - 14:48 nvd
Patch available
CVE Published
Feb 26, 2026 - 02:16 nvd
MEDIUM 5.4

Tags

XSS Svelte Redhat

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.

Analysis

Improper output encoding in Svelte versions prior to 5.53.5 allows attackers to inject malicious HTML and execute arbitrary JavaScript in user browsers through unescaped error messages returned by the transformError function. An attacker who can control error content can exploit this XSS vulnerability to compromise application security and user data. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

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Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +27
POC: 0

Vendor Status

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CVE-2026-27902 vulnerability details – vuln.today
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