CVE-2025-43596: MSP360 Backup (for Windows) insecure filesystem permissions

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-22 · updated 2026-06-17
Weakness: CWE-276

Description

An insecure file system permissions vulnerability in MSP360 Backup 8.0 allows a low privileged user to execute commands with SYSTEM level privileges using a specially crafted file with an arbitrary file backup target. Upgrade to MSP360 Backup 8.1.1.19 (released on 2025-05-15).

Affected products

MSP360 Backup: from 8.0 before 8.1.1.19 — fixed in 8.1.1.19

How to fix

Upgrade to a fixed version: MSP360 Backup 8.1.1.19. Check the vendor advisory for mitigations.

References

https://help.msp360.com/cloudberry-backup/security/admin-privileges
https://help.msp360.com/cloudberry-backup/whats-new
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-119-01.json
https://www.cve.org/CVERecord?id=CVE-2025-43596

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