Vulnerability details
CVE-2025-3519
Unblu Spark
Replace uploaded files knowing the file upload ID
CVSS 4.0
7.0High
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.0High | 4.0 | CVEProject cvelistV5 (CNA) (NCSC.ch) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Unblu inc. | Unblu Spark | 8.0.0 ≤ v ≤ 8.12.1 | CVEProject cvelistV5 (CNA) |
References and advisories
1
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Details
- Published
- 2025-04-22
- Last updated
- 2025-04-22
- State
- Published
- Assigner (CNA)
- NCSC.ch
Exploit prediction (EPSS)
0.29%
Probability of exploitation in 30 days
22.5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-639Authorization Bypass Through User-Controlled Key