CVE-2025-3518: spark Access Control Flaw — Fix

Description

It technically possible for a user to upload a file to a conversation despite the file upload functionality being disabled. The file upload functionality can be enabled or disabled for specific use cases through configuration. In case the functionality is disabled for at least one use case, the system nevertheless allows files to be uploaded through direct API requests. During the upload file, interception and allowed file type rules are still applied correctly. If file sharing is generally enabled, this issue is not of concern.

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-284 CWE-284

Affected Products

Vendor	Product	Versions
unblu	spark	7.0.1 — 7.54.1
unblu	spark	8.0.1 — 8.13.1

References

Advisories & Patches

https://www.unblu.com/en/docs/latest/security-bulletins/#UBL-2025-002

Frequently Asked Questions

What is CVE-2025-3518? +

It technically possible for a user to upload a file to a conversation despite the file upload functionality being disabled. The file upload functionality can be enabled or disabled for specific use cases through configuration. In case the functionality is disabled for at least one use case, the system nevertheless allows files to be uploaded through direct API requests. During the upload file, interception and allowed file type rules are still applied correctly. If file sharing is generally enabled, this issue is not of concern. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-3518? +

CVE-2025-3518 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-3518? +

CVE-2025-3518 affects products from unblu, specifically: spark. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-3518? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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