KEV · Actively exploited
CVE-2026-42897
CRITICAL 8.1
KEV
Microsoft Exchange Server Spoofing Vulnerability
EPSS
10.34%
moderate exploit risk
percentile 93.3%
CISA Known Exploited Vulnerability
- Added to KEV
- 2026-05-15
- Remediation deadline
- 2026-05-29
- Required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Ransomware
- No