MSP360 Backup (for Windows) insecure filesystem permissions

published 2025-05-22 17 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-16169

cvss: 7.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits: 0; none known

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).

Patch / fix

fixed in 1

MSP360 Backup 8.1.1.19

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa vex VA-25-119-01 updated 2025-05-19 cvss 7.8

MSP360 Backup insecure filesystem permissions

MSP360 Backup 8.0
affected: vendor fix help.msp360.com
MSP360 Backup 8.1.1.19
fixed: vendor fix help.msp360.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 17 mo ago (2025-05-22)

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA	4.0	8.5	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	4.0	8.5	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

MSP360 Backup

Classification

Weakness

CWE-276 Incorrect Default Permissions

References

help.msp360.com /cloudberry-backup/whats-new
release-notes
help.msp360.com /cloudberry-backup/security/admin-privileges
product
raw.githubusercontent.com /cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-119-01.json
third-party-advisory
cve.org /CVERecord?id=CVE-2025-43596
third-party-advisory

Sources

CVE List CVE-2025-43596
NVD CVE-2025-43596

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary