{"id":"CVE-2026-21873","state":"PUBLISHED","title":"Zero-click XSS in all NiceGUI apps which uses `ui.sub_pages`","description":"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.","publishedAt":"2026-01-08T09:50:23.361Z","updatedAt":"2026-01-08T15:11:24.092Z","severity":{"score":7.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["zauberzeug nicegui"],"affected":[{"vendor":"zauberzeug","product":"nicegui","versions":[{"version":">= 2.22.0, < 3.5.0","status":"affected"}]}],"references":["https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr","https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/21xxx/CVE-2026-21873.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-21873","state":"PUBLISHED","datePublished":"2026-01-08T09:50:23.361Z","dateUpdated":"2026-01-08T15:11:24.092Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-05T16:44:16.369Z"},"containers":{"cna":{"title":"Zero-click XSS in all NiceGUI apps which uses `ui.sub_pages`","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."}],"affected":[{"vendor":"zauberzeug","product":"nicegui","versions":[{"version":">= 2.22.0, < 3.5.0","status":"affected"}]}],"references":[{"url":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr","name":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0","name":"https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-01-08T09:50:23.361Z"},"source":{"advisory":"GHSA-mhpg-c27v-6mxr","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-08T15:11:24.092Z"}}]}}}