CVE-2026-26129CriticalMonitor
M365 Copilot Information Disclosure Vulnerability
Severity Critical · Urgency Monitor
Why it matters: Critical severity (CVSS 7.5)
Information Disclosure · Critical · CVSS 7.5. Affects: Microsoft 365 Copilot's Business Chat.
Affected: Microsoft 365 Copilot's Business Chat
Change history
2026-06-23 · First seen