CVE-2026-27119
MEDIUMsvelte 5.39.3-5.51.4 - Cross-Site Scripting in Server-Side Rendering Option Element
Title source: llmDescription
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.
References (1)
Core 1
Core References
Vendor Advisory x_refsource_confirm
https://github.com/sveltejs/svelte/security/advisories/GHSA-h7h7-mm68-gmrc
Scores
CVSS v3
5.4
EPSS
0.0001
EPSS Percentile
1.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (2)
npm/svelte
5.39.3 - 5.51.5npm
svelte/svelte
5.39.3 - 5.51.5
Published
Feb 20, 2026
Tracked Since
Feb 21, 2026