CVE-2026-3564: CWE-347 Improper Verification of Cryptographic Signature in ConnectWise ScreenConnect
A condition in the ScreenConnect server component may allow an actor with access to server-level cryptographic material used for authentication to obtain unauthorized access, including elevated privileges, in certain scenarios. ScreenConnect host and guest client agents are not independently affected by this CVE.
AI Analysis
Technical Summary
This vulnerability (CWE-347) in ConnectWise ScreenConnect's server component allows an actor who has access to server-level cryptographic authentication material to bypass proper signature verification. This can lead to unauthorized access and privilege escalation within the server environment. The issue does not impact the host or guest client agents. The CVSS 3.1 score is 9.0, indicating a critical severity with network attack vector, high complexity, no privileges required, no user interaction, and complete confidentiality, integrity, and availability impact. The affected versions are all ScreenConnect versions before 26.1.
Potential Impact
An attacker with access to the server's cryptographic authentication material can exploit this vulnerability to gain unauthorized access and escalate privileges on the ScreenConnect server. This compromises confidentiality, integrity, and availability of the affected system. The host and guest client agents remain unaffected, limiting the scope to the server component only.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict access to server-level cryptographic materials and monitor for unauthorized access attempts. Follow vendor advisories closely for updates on remediation.
CVE-2026-3564: CWE-347 Improper Verification of Cryptographic Signature in ConnectWise ScreenConnect
Description
A condition in the ScreenConnect server component may allow an actor with access to server-level cryptographic material used for authentication to obtain unauthorized access, including elevated privileges, in certain scenarios. ScreenConnect host and guest client agents are not independently affected by this CVE.
CVSS v3.1
Score 9.0critical
Affected software
pkg:github/connectwise/screenconnectRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-347) in ConnectWise ScreenConnect's server component allows an actor who has access to server-level cryptographic authentication material to bypass proper signature verification. This can lead to unauthorized access and privilege escalation within the server environment. The issue does not impact the host or guest client agents. The CVSS 3.1 score is 9.0, indicating a critical severity with network attack vector, high complexity, no privileges required, no user interaction, and complete confidentiality, integrity, and availability impact. The affected versions are all ScreenConnect versions before 26.1.
Potential Impact
An attacker with access to the server's cryptographic authentication material can exploit this vulnerability to gain unauthorized access and escalate privileges on the ScreenConnect server. This compromises confidentiality, integrity, and availability of the affected system. The host and guest client agents remain unaffected, limiting the scope to the server component only.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict access to server-level cryptographic materials and monitor for unauthorized access attempts. Follow vendor advisories closely for updates on remediation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ConnectWise
- Date Reserved
- 2026-03-04T20:04:12.757Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69b96f91771bdb1749ba8fa0
Added to database: 03/17/2026, 15:13:21 UTC
Last enriched: 07/10/2026, 08:00:18 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 332
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