CVE-2026-54130: critical vulnerability in Microsoft 365 Copilot
M365 Copilot Information Disclosure Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 1.1%
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
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
Affected products
Microsoft · Microsoft 365 CopilotRelated CVEs — Microsoft 365 Copilot
In the same product, most dangerous first.
CVE-2026-42824MEDIUMM365 Copilot Information Disclosure VulnerabilityEPSS 7.6%CVE-2025-32711CRITICALM365 Copilot Information Disclosure VulnerabilityEPSS 7.2%CVE-2026-50517CRITICALMicrosoft M365 Copilot Remote Code Execution VulnerabilityEPSS 1.7%CVE-2026-24307CRITICALM365 Copilot Information Disclosure VulnerabilityEPSS 0.9%CVE-2026-85887HIGHM365 Copilot Information Disclosure VulnerabilityEPSS 0.8%CVE-2026-24299MEDIUMM365 Copilot Information Disclosure VulnerabilityEPSS 0.8%