{"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"}}]}}