Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2026-54130 |
| Alert Source | GitHub Advisory - Critical Vulnerability |
| CVE Publication Year | 2026 |
| Date Published | 2026-06-19 |
| Vendor | Microsoft |
| Product | M365 Copilot |
| CVSS Score | 9.8 (critical) |
| EPSS Score | No data |
| CISA KEV | No |
| Ransomware | Not confirmed |
Vulnerability Description
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Required Actions
Apply vendor patches or mitigations as soon as available.
Who Is Affected?
This vulnerability affects M365 Copilot by Microsoft. Check whether your organization uses this software and whether it requires an update.
Sources
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