Vulnerability · Published Apr 22, 2025 · Assigned by NCSC.ch
CVE-2025-3519Replace uploaded files knowing the file upload ID
High 7.0
In plain English
A high-severity authorization bypass via user-controlled key in Unblu Spark from Unblu inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unblu inc. | Unblu Spark | 8.0.0 – through 8.12.1 |
Weakness: CWE-639 · Vector: 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