ConnectWise ScreenConnect Authentication Bypass Vulnerability
ConnectWise ScreenConnect 23.9.7 and prior are affected by an Authentication Bypass Using an Alternate Path or Channel vulnerability, which may allow an attacker direct access to confidential information or critical systems.
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 5 / 5
- KEV catalog (CISA)22 Feb 2024
- Exploited in EUVD (ENISA)22 Feb 2024
- Used by ransomwareyes
- EPSS above 10 %99.98%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
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
- 0 ≤23.9.7
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
-
Published
-
Exploitation reported (ENISA)
-
Added to the KEV catalog
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CISA remediation due date
-
EPSS peak: 99.98%
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-84869ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerability5.2 · Actively exploited
- CVE-2024-1708ConnectWise ScreenConnect Path Traversal Vulnerability8.6 · Background exploitation
- CVE-2025-3935ConnectWise ScreenConnect Improper Authentication Vulnerability5.1 · Background exploitation