CVE-2026-54130
M365 Copilot Information Disclosure Vulnerability
- State
- Published
- Severity
- 9.8 Critical
- Published
- Jun 18, 2026
- Updated
- Sep 24, 2026
- Reserved
- Jun 11, 2026
Description
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C | microsoft |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
Microsoft 365 CopilotMicrosoft |
|
References
- M365 Copilot Information Disclosure Vulnerabilityvendor-advisorypatch
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