CVE-2025-50328
HIGH EPSS 25.2%
Published Apr 29, 20262mo ago · Modified Jun 17, 20261w ago
7.3 CVSS 3.1
Published Apr 29, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago
Description
A vulnerability in B1 Free Archiver v1.5.86 allows files extracted from downloaded archives to bypass Windows Mark of the Web (MotW) protections. When an archive is downloaded from the internet and extracted using B1 Free Archiver, the software fails to propagate the 'Zone.Identifier' alternate data stream to the extracted files. As a result, these files can be executed without triggering Windows Defender SmartScreen warnings or security prompts, enabling untrusted code execution without standard security restrictions.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability Low
Threat Intelligence
EPSS Exploit Probability
25.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-290
References 2
- b1.org https://b1.org/
- github.com https://github.com/math69b/B1FREE/blob/main/B1%20Free%20Archiver%20version
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.