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vuln-cve/data/2026/21xxx/CVE-2026-21873.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-21873",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2026-01-05T16:44:16.369Z",
"datePublished": "2026-01-08T09:50:23.361Z",
"dateUpdated": "2026-01-08T15:11:24.092Z"
},
"containers": {
"cna": {
"title": "Zero-click XSS in all NiceGUI apps which uses `ui.sub_pages`",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-79",
"lang": "en",
"description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
"version": "3.1"
}
}
],
"references": [
{
"name": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr"
},
{
"name": "https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0"
}
],
"affected": [
{
"vendor": "zauberzeug",
"product": "nicegui",
"versions": [
{
"version": ">= 2.22.0, < 3.5.0",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-01-08T09:50:23.361Z"
},
"descriptions": [
{
"lang": "en",
"value": "NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the pushstate event listener used by ui.sub_pages allows an attacker to manipulate the fragment identifier of the URL, which they can do despite being cross-site, using an iframe. This issue has been patched in version 3.5.0."
}
],
"source": {
"advisory": "GHSA-mhpg-c27v-6mxr",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-01-08T15:11:07.042037Z",
"id": "CVE-2026-21873",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"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": "2026-01-08T15:11:24.092Z"
}
}
]
}
}