Vulnerability in Msp360 Free Backup
CVE-2025-12838
MSP360 Free Backup Link Following Local Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of MSP360 Free Backup. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. User interaction on the part of an administrator is needed additionally. The specific flaw exists within the restore functionality. By creating a junction, an attacker can abuse the service to create arbitrary files. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-27245.
EPSS: 0.002 (5.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Msp360 Free Backup — versions 8.1.0.620
Weakness classification (CWE)
References
- zdi-disclosures@trendmicro.com (x_research-advisory)
Frequently asked questions
- What is CVE-2025-12838?
- CVE-2025-12838 is a high-severity vulnerability in Msp360 Free Backup, classified under Improper Link Resolution Before File Access. CVSS score: 7.3/10. Published 2025-12-23.
- How severe is CVE-2025-12838?
- High severity. CVSS v3 base score is 7.3 out of 10.