CVE-2025-3519 Replace uploaded files knowing the file upload ID
An attacker with a file ID can replace uploaded files in Unblu Spark conversations without proper authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-3519?
CVE-2025-3519 is a high-severity missing authorization vulnerability in Unblu Spark, published on 22 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-639
Which versions are affected by CVE-2025-3519?
How do I fix CVE-2025-3519?
No fix has been published for CVE-2025-3519 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-3519 being exploited?
There is no known exploitation of CVE-2025-3519 in the wild and no public exploit code.
Sources
Also known as GHSA-2m3f-82cc-h56x.