CVE-2026-27122

MEDIUM
2026-02-20 [email protected] GHSA-m56q-vw4c-c2cp
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. Prior to 5.51.5, when using <svelte:element this={tag}> in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.

Analysis

HTML injection in Svelte's server-side rendering occurs when the `<svelte:element>` tag parameter fails to sanitize user-supplied tag names, allowing attackers to inject malicious HTML into rendered output. This affects Svelte versions prior to 5.51.5 and requires user interaction to exploit, with client-side rendering remaining unaffected. …

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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-2026-27122 vulnerability details – vuln.today
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