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CVE-2026-100263

Estado: AnalizadaMedia (6.1)—

In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

CWE-79 (XSS almacenado) via User-Agent en YouTrack permite inyección HTML/JavaScript. El vector AV:N/UI:R sugiere interacción del usuario (T1189 drive-by). El impacto potencial incluye ejecución de scripts del lado del cliente (T1059.007) y phishing/credential harvesting (T1598.003) mediante payload

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

User TrainingRestrict Web-Based ContentExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or ProgramApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Jetbrains — Youtrack

CWE

Referencias

JSON original (NVD)

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