Monday opens with a trust problem. A mail server flaw is under active use. A network control system was targeted. Trusted packages were poisoned. A fake model page pushed a stealer. Then came the familiar ransom claim: the data was returned and deleted.
The pattern is clear. One weak dependency can leak keys. One leaked key can open cloud access. One cloud foothold can become a production incident. AI is speeding up vulnerability discovery, attackers are moving quickly, and old exposure still keeps paying off.
Patch the quiet risks first. Let’s get into it.
On-Prem Microsoft Exchange Server Exploited in the Wild—Microsoft disclosed a security vulnerability impacting on-premise versions of Exchange Server, which has come under active exploitation in the wild. The vulnerability, tracked as CVE-2026-42897 (CVSS score: 8.1), has been described as a spoofing bug stemming from a cross-site scripting flaw. An anonymous researcher has been credited with discovering and reporting the issue. Microsoft is providing a temporary mitigation through its Exchange Emergency Mitigation Service, while it's readying a permanent fix for the security defect. There are currently no details on how the vulnerability is being exploited, the identity of the threat actor behind the activity, or the scale of such efforts. It's also unclear who the targets are and if any of those attacks were successful.
