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Vulnerabilities

Vulnerability · CVE-2025-3519

An authorization bypass in Unblu Spark allows a participant of a conversation to replace an existing, uploaded file.

Published Apr 22, 2025 · catalog updated Apr 22, 2025 · Unblu inc. Unblu Spark

Check if you run it

No confirmed exploitation is on record for CVE-2025-3519. EPSS is 0.29%. Act only if a listed version of Unblu inc. Unblu Spark is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.29%
Remediation
Advisory link
Affected products
vendor Unblu inc. Unblu Spark 8.0.0 ≤8.12.1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Unblu inc. Unblu Spark 8.0.0 ≤8.12.18.0.0 ≤8.12.1

How to fix CVE-2025-3519

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-3519. EPSS is 0.29%. Act only if a listed version of Unblu inc. Unblu Spark is installed.

Which versions are affected?

Compare what you have installed with Unblu inc. Unblu Spark 8.0.0 ≤8.12.1 8.0.0 ≤8.12.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 22, 2025 · EUVD

    Detected

    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 us

  2. Apr 22, 2025 · EUVD

    Updated

    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 us

Sources

  • CVE.orgVulnerability recordCVE-2025-3519

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-3519

    30-day exploitation probability 0.3%

    first.org
  • EUVDVulnerability recordEUVD-2025-12326

    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 acces

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.