PT-2025-17491 · Unblu · Unblu Spark

Andrei Dabrakou · Published 2025-04-22 · Updated 2025-04-22 · CVE-2025-3519

Positive Technologies (AI Summary)

CVSS v4.0

7.0

High

Base vector

AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Unblu Spark versions 8.0.0 through 8.12.1 Unblu Spark version 8.13.1

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). If 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.

Recommendations For Unblu Spark versions 8.0.0 through 8.12.1, consider disabling file upload functionality until a patch is available. For Unblu Spark version 8.13.1, consider restricting access to file upload functionality until a patch is available. As a temporary workaround, consider implementing additional authorization checks for file uploads to prevent unauthorized file replacement.

Fix

IDOR

Weakness Enumeration

CWE-639

Related Identifiers

CVE-2025-3519

Affected Products

Unblu Spark

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2025-3519 · Security Note
• https://twitter.com/VulmonFeeds/status/1914613549994848747 · Twitter Post
• https://twitter.com/cybercronai/status/1914711676361887821 · Twitter Post
• https://unblu.com/en/docs/latest/security-bulletins/#UBL-2025-001 · Note
• https://t.me/cvedetector/23489 · Telegram Post
• https://t.me/latest_high_impact_cve/2187 · Telegram Post
• https://t.me/cvenotify/119304 · Telegram Post
• https://twitter.com/CVEnew/status/1914604384668766330 · Twitter Post