CVE-2026-113609 Bandisoft CVE debrief

Who should care

Defenders and administrators responsible for systems where Bandizip is used should assess exposure and prioritize updating to version 7.47 or later. This includes IT teams managing software deployments, cybersecurity teams monitoring for suspicious activity, and system administrators responsible for maintaining system security.

Why it matters

CVE-2026-113609 is a Mark-of-the-Web bypass vulnerability in Bandisoft Bandizip before 7.47, allowing attackers to bypass zone-based execution protections and run unsigned PowerShell scripts or modules. Defenders should prioritize verifying Bandizip versions and updating to 7.47 or later, assessing exposure in systems where Bandizip is used, and monitoring for suspicious PowerShell script execution.

• Bypassing zone-based execution protections allows attackers to run unsigned PowerShell scripts or modules under the RemoteSigned policy
• Defenders need to verify Bandizip versions and update to 7.47 or later to mitigate the vulnerability
• Exposure to this vulnerability may allow attackers to execute malicious PowerShell scripts

Technical summary

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. This vulnerability enables attackers to deliver unsigned PowerShell scripts or modules in downloaded archives that run under the RemoteSigned policy when invoked by the user. The vulnerability affects Bandizip versions prior to 7.47 and can be mitigated by updating to 7.47 or later. Defenders should prioritize verifying Bandizip versions and updating to 7.47 or later.

Defensive priority

Defenders should prioritize verifying Bandizip versions and updating to 7.47 or later, assessing exposure in systems where Bandizip is used, and monitoring for suspicious PowerShell script execution.

Recommended defensive actions

• Verify Bandizip versions and update to 7.47 or later
• Assess exposure in systems where Bandizip is used
• Monitor for suspicious PowerShell script execution
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the Mark-of-the-Web bypass vulnerability in Bandizip before 7.47. The NVD entry is currently UNASSIGNED. Evidence is limited to public CVE Program and NVD records, which may not cover all affected versions or scenarios. Defenders should verify Bandizip versions, assess exposure, and monitor for suspicious PowerShell script execution.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.