---
id: "CVE-2026-113609"
kind: "vulnerability"
aliases: ["CVE-2026-113609"]
title: "Bandizip: extracted PowerShell scripts lose Mark-of-the-Web, bypassing execution warnings"
severity: "medium"
cvss: 4.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["bandizip", "package", "powershell", "windows"]
not_affected_if: ["bandizip-7.47-or-later", "no-untrusted-archives"]
published_at: "2026-10-20T16:17:11+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-25T04:33:22+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113609", "first_seen_at": "2026-10-23T21:57:20+00:00"}]
---

# Bandizip: extracted PowerShell scripts lose Mark-of-the-Web, bypassing execution warnings

Bandizip before 7.47 does not carry the Mark-of-the-Web flag onto .ps1 and .psm1 files it extracts from archives. An attacker who ships an unsigned script in a downloaded archive can get it to run under the RemoteSigned PowerShell policy when the user invokes it.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Bandizip version in Bandizip's About dialog; versions below `7.47` are affected.
- Extract a test archive containing a `.ps1` from a file downloaded from the internet and check whether the extracted file has a Zone.Identifier stream (`Get-Item file.ps1 -Stream *`).

## Fix

- Upgrade Bandizip to `7.47` or later.
- Until upgraded, avoid running `.ps1` or `.psm1` files extracted from untrusted archives.

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-113609

## From the sources

Bandisoft Bandizip before 7.47 fails to propagate Mark-of-the-Web to extracted .ps1 and .psm1 files, allowing attackers to bypass zone-based execution protections. Attackers can deliver unsigned PowerShell scripts or modules in downloaded archives that run under the RemoteSigned policy when the user invokes them.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_