{"action":"Upgrade nicegui to 3.5.0 or later.","affected":[{"fixed":"3.5.0","introduced":"2.13.0"}],"component":"nicegui","cve_ids":["CVE-2026-21871"],"ecosystem":"PyPI","epss":0.00273,"exploited":false,"fixed_versions":["3.5.0"],"ghsa_id":"GHSA-7grm-h62g-5m97","id":"tcs_01M5KF5Z1CESA64C5YMBNMV0R6","modified_at":"2026-07-07T17:57:28.403615598Z","published_at":"2026-01-08T20:00:29Z","references":["https://osv.dev/vulnerability/GHSA-7grm-h62g-5m97","https://github.com/zauberzeug/nicegui/security/advisories/GHSA-7grm-h62g-5m97","https://nvd.nist.gov/vuln/detail/CVE-2026-21871","https://github.com/zauberzeug/nicegui","https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"GHSA-7grm-h62g-5m97","url":"https://osv.dev/vulnerability/GHSA-7grm-h62g-5m97"}],"summary":"NiceGUI is vulnerable to XSS via Unescaped URL in ui.navigate.history.push() / replace()"}