CVE-2026-25516

{"id": "CVE-2026-25516", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.8}]}, "published": "2026-02-06T22:16:11.300", "references": [{"url": "https://github.com/zauberzeug/nicegui/commit/f1f7533577875af7d23f161ed3627f73584cb561", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-v82v-c5x8-w282", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "NiceGUI is a Python-based UI framework. The ui.markdown() component uses the markdown2 library to convert markdown content to HTML, which is then rendered via innerHTML. By default, markdown2 allows raw HTML to pass through unchanged. This means that if an application renders user-controlled content through ui.markdown(), an attacker can inject malicious HTML containing JavaScript event handlers. Unlike other NiceGUI components that render HTML (ui.html(), ui.chat_message(), ui.interactive_image()), the ui.markdown() component does not provide or require a sanitize parameter, leaving applications vulnerable to XSS attacks. This vulnerability is fixed in 3.7.0."}, {"lang": "es", "value": "NiceGUI es un framework de interfaz de usuario (UI) basado en Python. El componente ui.markdown() utiliza la biblioteca markdown2 para convertir contenido markdown a HTML, que luego se renderiza a trav\u00e9s de innerHTML. Por defecto, markdown2 permite que el HTML sin procesar pase sin cambios. Esto significa que si una aplicaci\u00f3n renderiza contenido controlado por el usuario a trav\u00e9s de ui.markdown(), un atacante puede inyectar HTML malicioso que contenga manejadores de eventos de JavaScript. A diferencia de otros componentes de NiceGUI que renderizan HTML (ui.html(), ui.chat_message(), ui.interactive_image()), el componente ui.markdown() no proporciona ni requiere un par\u00e1metro de saneamiento, dejando las aplicaciones vulnerables a ataques XSS. Esta vulnerabilidad se corrige en la versi\u00f3n 3.7.0."}], "lastModified": "2026-02-20T15:43:23.177", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "68362D51-C57A-4D2E-A22C-8BAA68A4CBD2", "versionEndExcluding": "3.7.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}