CVE-2025-3519: fallo de gravedad alta en Unblu Spark
Replace uploaded files knowing the file upload ID
Publicada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 7epss 0.3%
An authorization bypass in Unblu Spark allows a participant of a conversation to replace an existing, uploaded file.
Every uploaded file in Unblu gets assigned with a randomly generated Universally Unique ID (UUID). In case a participant of this or another conversation gets access to such a file ID, it can be used to replace the file without changing the file name and details or the name of the user who uploaded the file. During the upload, file interception and allowed file type rules are still applied correctly.
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
Productos afectados
Unblu inc. · Unblu SparkCVEs relacionadas — Unblu Spark
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-14933HIGHUnblu Spark Cross-Site Scripting in Embedded Co-BrowsingEPSS 0.6%CVE-2026-8152CRITICALUnblu Spark Open Redirect leading to DOM-Based XSSEPSS 0.4%CVE-2026-9589CRITICALUnblu Spark Authorization Bypass in Configuration Cascade OperationsEPSS 0.4%CVE-2025-3518MEDIUMFile upload functionality possible even when disabledEPSS 0.2%