CVE-2025-50328 Security feature bypass in n/a
B1 Free Archiver fails to propagate Zone.Identifier, allowing extracted files to bypass Windows SmartScreen and execute untrusted code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-50328?
CVE-2025-50328 is a high-severity vulnerability in n/a, published on 29 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-290
Which versions are affected by CVE-2025-50328?
How do I fix CVE-2025-50328?
No fix has been published for CVE-2025-50328 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-50328 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-50328 exists.
Sources
Also known as GHSA-vh8g-ch7v-39pg.