ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerability
A condition in the ScreenConnect client may allow files to be transferred and executed through an active remote session without authorization or Host confirmation in certain circumstances. ScreenConnect servers are not impacted.
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 2 / 5
- KEV catalog (CISA)11 Sept 2026
- Exploited in EUVD (ENISA)11 Sept 2026
- Used by ransomwareno
- EPSS above 10 %0.92%
- No account, over the networkno
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Affected products
- All versions prior to 26.6.5
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
-
Published
-
Exploitation reported (ENISA)
-
Added to the KEV catalog
-
CISA remediation due date
References
Other exploited vulnerabilities from the same vendor
- CVE-2024-1708ConnectWise ScreenConnect Path Traversal Vulnerability8.6 · Background exploitation
- CVE-2025-3935ConnectWise ScreenConnect Improper Authentication Vulnerability5.1 · Background exploitation
- CVE-2024-1709ConnectWise ScreenConnect Authentication Bypass Vulnerability10.0 · Background exploitation