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vuln-cve/data/2026/27xxx/CVE-2026-27121.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-27121",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2026-02-17T18:42:27.043Z",
"datePublished": "2026-02-20T22:27:36.103Z",
"dateUpdated": "2026-02-23T19:34:18.150Z"
},
"containers": {
"cna": {
"title": "Svelte affected by cross-site scripting via spread attributes in Svelte SSR",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-79",
"lang": "en",
"description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"attackRequirements": "PRESENT",
"privilegesRequired": "HIGH",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE",
"vulnAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
"subAvailabilityImpact": "NONE",
"baseScore": 5.1,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N",
"version": "4.0"
}
}
],
"references": [
{
"name": "https://github.com/sveltejs/svelte/security/advisories/GHSA-f7gr-6p89-r883",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/sveltejs/svelte/security/advisories/GHSA-f7gr-6p89-r883"
}
],
"affected": [
{
"vendor": "sveltejs",
"product": "svelte",
"versions": [
{
"version": "< 5.51.5",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-02-20T22:27:36.103Z"
},
"descriptions": [
{
"lang": "en",
"value": "svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. This vulnerability is fixed in 5.51.5."
}
],
"source": {
"advisory": "GHSA-f7gr-6p89-r883",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-02-23T19:31:36.117864Z",
"id": "CVE-2026-27121",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-02-23T19:34:18.150Z"
}
}
]
}
}