ConnectWise (SkyKick) Vendor Credentials Abused in M365 Attacks
Affects Gladinet CentreStack and TriofoxSource AlienVault OTX General
No CVSS score published yet
- Exploitation
Actively exploited – in CISA KEV since 11/04/2025
- KEV deadline
- 11/25/2025
- EPSS
- 92.1% chance of exploitation in 30 days – higher than 99% of CVEs
What to do
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description
A Microsoft 365 API credential belonging to ConnectWise Cloud Backup (formerly SkyKick) was compromised and used by a threat actor to gain unauthorized access to hundreds of customer M365 environments. The attacker authenticated from a specific IP address on October 15, obtaining Microsoft Graph access tokens and moving through tenants in an automated manner. The ConnectWise Cloud Management MS Teams application was elevated to Global Administrator in at least one case, allowing the attacker to add credentials to other applications, including security tools. The campaign began with password spraying against law firms, followed by role assignments in about 50 tenants, and widespread credential abuse across nearly 1,000 Entra tenants. A second wave targeted 16 tenants in sensitive sectors such as policy, national security, trade, and critical minerals.
Weaknesses
Indicators of compromise
IP addresses 3
- 144.172.64.99
- 144.172.64.128
- 144.172.64.60
CVEs 1
- CVE-2025-11371