by Kastro
Paper/Archive/CVE-2026-54130

CVE-2026-54130

Microsoft Microsoft 365 Copilot — M365 Copilot Information Disclosure Vulnerability

EPSS 1%CVSS 9.8
critical.is priorityof 100
42
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 65.2.652 × 2013.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Affected

ProductAffectedFixed inSource
Microsoft 365 Copilot-–CNA

Scores by source

microsoft (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

patchmsrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130