SANS Stormcast Tuesday, May 19th, 2026: New libssh in Malware; Exchange 0-Day; MSFT Authenticator Update

New Malware Libraries means New Signatures
https://isc.sans.edu/diary/%5BGuest%20Diary%5D%20%20New%20Malware%20Libraries%20means%20New%20Signatures/32986
Addressing Exchange Server May 2026 vulnerability CVE-2026-42897
https://techcommunity.microsoft.com/blog/exchange/addressing-exchange-server-may-2026-vulnerability-cve-2026-42897/4518498
Microsoft Authenticator Update CVE-2026-41615
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41615
ssh-keysign-pwn (CVE-2026-46333) Patches Released
https://almalinux.org/blog/2026-05-15-ssh-keysign-pwn-cve-2026-46333/