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TI-2025-03091 Aliases CVE-2025-3519GHSA-2m3f-82cc-h56x

Replace uploaded files knowing the file upload ID

Priority LOW 31CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00298 22nd percentileScored 2026-11-07
Fix Fixed Unblu Spark (Unblu inc.): 8.13.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Unblu inc.Unblu Spark8.0.0 – 8.12.18.13.1Patch availableCNA
  • Unblu Spark VendorUnblu inc. Affected 8.0.0 – 8.12.1 Fixed in 8.13.1 Patch available CNA

Remediation

  • Fix · CNA Unblu Spark (Unblu inc.) Fixed in 8.13.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-3519
  2. 2026-10-03 Alias added: GHSA-2m3f-82cc-h56x

References

Other 1

  • TI-2026-76784 Missing authorization in Unblu Spark configuration cascade operations CVSS 4.0CRITICAL 9.3
  • TI-2026-76785 Cross-site scripting in Unblu Spark embedded co-browsing CVSS 4.0HIGH 8.6
  • TI-2026-07180 Unblu Spark Open Redirect leading to DOM-Based XSS CVSS 4.0CRITICAL 9.3
  • TI-2025-03090 File upload functionality possible even when disabled CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences