CVE-2025-3519
CVE-2025-3519 is a high-severity vulnerability with a CVSS 4.0 base score of 7.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-639.
Key facts
- Severity: High (CVSS 4.0 base score 7.0)
- EPSS exploit prediction: 0% (14th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-12326
- Weakness: CWE-639
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2025-3519?
- 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.
- How severe is CVE-2025-3519?
- CVE-2025-3519 has a CVSS 4.0 base score of 7.0, rated high severity.
- Is CVE-2025-3519 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-3519?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2025-3519 have an EU (EUVD) identifier?
- Yes. CVE-2025-3519 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12326.
- When was CVE-2025-3519 published?
- CVE-2025-3519 was published on 2025-04-22 and last updated on 2026-06-17.
References
Other CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities
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