Quick answers
- Is CVE-2026-3564 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-3564 being exploited in the wild.
- How severe is CVE-2026-3564?
- Critical severity, with a CVSS score of 9, published 17 March 2026.
- Which products and versions are affected?
- ConnectWise ScreenConnect All server versions prior to 26.1.
- Is there a fix for CVE-2026-3564?
- A patch was published on 2026-03-17: Fixed in version 26.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-3564 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-3564?
- Check whether you run ConnectWise ScreenConnect at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A vulnerability exists in the ConnectWise ScreenConnect server component due to improper verification of cryptographic signatures (CWE-347). In versions prior to 26.1, unique machine keys used for authentication were stored within server configuration files in a manner that could allow an attacker with access to this cryptographic material to forge authentication tokens. While the attack complexity is high because it requires prior access to server-level secrets, a successful exploit allows for complete authentication bypass and privilege escalation. ConnectWise has addressed this in version 26.1 by implementing encrypted storage and improved management for these machine keys.
Affected products
- ConnectWise ScreenConnect All server versions prior to 26.1
Timeline
- 2026-03-17: disclosed
- 2026-03-17: patched: Fixed in version 26.1
- 2026-03-17: advisory