CVE-2025-3519 — Replace uploaded files knowing the file upload ID
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 …
Published: 2025-04-22 · CVSS: 7.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7