{"action":"Upgrade nicegui to 3.5.0 or later.","affected":[{"fixed":"3.5.0","introduced":"2.22.0"}],"component":"nicegui","cve_ids":["CVE-2026-21873"],"ecosystem":"PyPI","epss":0.0026,"exploited":false,"fixed_versions":["3.5.0"],"ghsa_id":"GHSA-mhpg-c27v-6mxr","id":"tcs_01M5KFR5VA22PHAE2T7XVDFNVC","modified_at":"2026-07-07T17:57:37.927767983Z","published_at":"2026-01-08T20:16:41Z","references":["https://osv.dev/vulnerability/GHSA-mhpg-c27v-6mxr","https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr","https://nvd.nist.gov/vuln/detail/CVE-2026-21873","https://github.com/zauberzeug/nicegui","https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0"],"severity":{"label":"high","score":7.2},"sources":[{"source":"osv","source_id":"GHSA-mhpg-c27v-6mxr","url":"https://osv.dev/vulnerability/GHSA-mhpg-c27v-6mxr"}],"summary":"NiceGUI apps which use `ui.sub_pages` vulnerable to zero-click XSS"}