Release notes

MetaDefender Storage Security v4.3.0

Release Date: February 27, 2026

Version supported until August 27, 2027

This release introduces Microsoft Teams support for enhanced collaboration security, auto-discovery for SharePoint Online to streamline setup, a new reprocess failed files feature for easier remediation, stability improvements, and concurrent scanning scenarios.

Highlights

  • Multitenancy (MDSS Cloud)

    • Support for multiple tenants within a single MDSS Cloud deployment

  • OpenTelemetry (Initial Release)

    • Collect and export telemetry data for monitoring and observability

  • Microsoft Teams Scanning

    • Scan and sanitize file attachments shared in Microsoft 365 Teams channels and chats

  • SharePoint Online Auto-Discovery

    • Automatically discover and connect SharePoint Online sites—no manual configuration required

  • Reprocess Failed Files

    • Create new scans targeting only previously failed files, with the flexibility to apply any workflow

  • Flexible Scan Scheduling

    • Schedule scans down to the minute for precise timing control

  • Real-Time Protection Limits (Cloud)

    • Configure scan limits for MDSS Cloud deployments to manage resource usage

Improvements

  • Scan Priority UX

    • Added tooltips and reordered priority options for clearer configuration

  • Storage Unit Display

    • Storage unit name now visible in scan configuration for easier identification

  • Sanitization Workflow Control

    • Original files deleted only after successful sanitization. New option to configure delete behavior separately for allowed and blocked files—enabling workflows like DeepCDR for blocked files only while leaving clean files untouched

  • Connection Reliability

    • Automatic retry on temporary connection failures

  • Performance

    • Loading indicator on download button when generating large scan reports

  • Report Export UX

    • Faster remediation processing for large-scale deployments

  • SMTP Configuration

    • Input validation for host field with helpful error messages for invalid entries

  • SharePoint Storage Units

    • Cloud and On-Prem storage units now use Site URL and Document Library URL fields. Existing configurations remain compatible, with a post-upgrade prompt to update

Bug Fixes

  • SMB Concurrent Scans

    • Fixed authentication failures when running multiple SMB scans simultaneously

  • Partition Scans

    • Resolved partition scan errors across all users

  • Scan Report Retention

    • Reports now correctly deleted only after retention period expires and only for completed scans

  • Import/Export

    • Notification imports now save valid settings even when some notification types fail validation
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