Security readout for executives and security teams
Plain-English summary
B1 Free Archiver v1.5.86 may remove Windows’ internet-origin warning from files extracted from downloaded archives. That can prevent SmartScreen and related prompts from appearing before a user runs untrusted files. The business risk is higher where employees receive and open archives from email, chat, or the web.
Executive priority
Prioritize discovery and vendor follow-up this week if B1 Free Archiver is present. The issue weakens a Windows safety control used to warn users before running internet-sourced files, but public evidence in the supplied sources is limited.
Technical view
The reported flaw is failure to propagate the Windows Zone.Identifier alternate data stream, known as Mark of the Web, from an internet-downloaded archive to extracted files. The CVE describes resulting execution without standard MotW-based SmartScreen warnings. The record lists CVSS 3.1 score 7.3, high severity, and CWE-290.
Likely exposure
Exposure is most likely on Windows endpoints with B1 Free Archiver v1.5.86 installed, especially where users extract archives downloaded from the internet. The CVE metadata does not provide CPEs or a fuller affected-version range.
Exploitation context
A likely abuse path is distributing an archive that a user extracts with B1 Free Archiver, leaving extracted files without MotW prompts. The provided sources do not show active exploitation, and the CVE is not listed as KEV in the supplied data.
Researcher notes
The record is sparse: affected vendor/product fields are n/a, references are the B1 site and a GitHub version reference, and no patch is named. Treat v1.5.86 as the specifically cited version unless vendor guidance expands scope.
Mitigation direction
- Inventory Windows endpoints for B1 Free Archiver v1.5.86.
- Check B1 vendor guidance for updates, fixed versions, or workarounds.
- Consider restricting or removing B1 Free Archiver where business need is low.
- Maintain endpoint protections for downloaded archives and executable content.
Validation and detection
- Confirm whether B1 Free Archiver v1.5.86 is present in software inventory.
- In a controlled lab, verify extracted internet-origin files retain Zone.Identifier.
- Review endpoint telemetry for B1 archive extraction on internet-sourced files.
- Track the CVE record and vendor site for updated remediation details.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-290: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-50328 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L3.93.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://b1.org/CVE reference
- https://github.com/math69b/B1FREE/blob/main/B1%20Free%20Archiver%20versionCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Authentication Bypass by Spoofing
Authentication Bypass by Spoofing represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.