Loading vulnerability…
CVE-2026-3564 is a critical vulnerability in ConnectWise ScreenConnect server versions prior to 26.1 involving inadequate protection and verification of server-level cryptographic authentication material, including ASP.NET machine keys. In affected versions, instance-specific cryptographic material was stored in server configuration data in a manner that could be exposed under certain conditions. An attacker who obtains this material can generate or modify protected values accepted by the ScreenConnect instance as valid, enabling abuse of session authentication and unauthorized access. The ScreenConnect host and guest client agents are not independently affected; the issue resides in the server component and its handling of authentication-related cryptographic material.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A ConnectWise ScreenConnect vulnerability related to protection of server-level cryptographic material, mentioned as part of vendor security history.
A machine key exposure vulnerability affecting ConnectWise ScreenConnect versions earlier than 26.1.
A critical vulnerability in ConnectWise ScreenConnect that allows a remote unauthenticated attacker to access instance cryptographic material (including ASP.NET keys), potentially access active sessions, and achieve privilege escalation.
A critical cryptographic vulnerability in ConnectWise ScreenConnect that allows extraction of server machine keys from plaintext configuration storage, enabling session authentication token forgery and session hijacking.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.