Medium severity · published Feb 20, 2026
CVE-2026-27119
Svelte affected by XSS in SSR `<option>` element
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SV
svelte · sveltejs
>= 5.39.3, < 5.51.5 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27119
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-27119
Vendor Advisory
https://github.com/sveltejs/svelte/security/advisories/GHSA-h7h7-mm68-gmrc
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