Microsoft Security Incident

Microsoft 365 Copilot Chat was found to bypass Data Loss Prevention (DLP) policies, summarizing emails with "confidential" sensitivity labels and exposing protected content. This vulnerability, tracked as CW1226324, stemmed from a code issue allowing Copilot to access emails in Draft and Sent folders despite configured restrictions, leading to unintended information disclosure within the chat interface.

What Happened

Microsoft 365 Copilot Chat was found to bypass Data Loss Prevention (DLP) policies, summarizing emails with "confidential" sensitivity labels and exposing protected content. This vulnerability, tracked as CW1226324, stemmed from a code issue allowing Copilot to access emails in Draft and Sent folders despite configured restrictions, leading to unintended information disclosure within the chat interface.

Why This Matters

Publisher reporting describes a security event affecting DLP. BugSkan could not yet bind a CVE or affected version, so treat the source details as the current record.

Recommended Action

Confirm whether DLP is present in your environment and review vendor guidance for this report. Apply available patches or mitigations if your deployment matches the described conditions.

Exposure

Exposure reason: This incident does not currently match a technology in My Interests.

Exploitation status: UNKNOWN

Primary entities:

Timeline

• Incident first seen
  Feb 18, 2026 05:30

  BugSkan first recorded this incident.

• Copilot Chat bug bypasses DLP on 'Confidential' email - theregister.com
  Feb 18, 2026 05:30

  theregister.com · Data Leak

Sources

Related Incidents

Other BugSkan incidents that share identifiers, products, or vendors with this report.

My Interests Match