CVE-2026-27119

MEDIUM
2026-02-20 [email protected] GHSA-h7h7-mm68-gmrc
5.4
CVSS 3.1
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CVSS Vector

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

Lifecycle Timeline

3
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 22:04 vuln.today
CVE Published
Feb 20, 2026 - 23:16 nvd
MEDIUM 5.4

Tags

XSS Svelte Redhat

Description

svelte performance oriented web framework. From 5.39.3, <=5.51.4, in certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.

Analysis

Improper HTML escaping in Svelte versions 5.39.3 through 5.51.4 allows HTML injection attacks through unescaped option element content during server-side rendering, enabling attackers to inject malicious HTML into SSR output. Client-side rendering is unaffected, and the vulnerability is limited to applications using vulnerable Svelte versions on the server. …

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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-2026-27119 vulnerability details – vuln.today
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