No exploitation reported

CVE-2026-54130

M365 Copilot Information Disclosure Vulnerability

No exploitation reported by the sources we read.

Published2026-06-18
WeaknessCWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC

2026-06-1822:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 15:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-54130?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-54130?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Microsoft 365 copilot

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

msrc.microsoft.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-06-23
OpenCVESSVC decisionnone—
CNACVSS 3.19.8read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
CNAweakness (CWE)CWE-306read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-22
Microsoft MSRCadvisory—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: 2026-06-18
Last Modified: 2026-06-25
NVD status: Analyzed
MSRC Title: M365 Copilot Information Disclosure Vulnerability

Frequently asked questions

What is CVE-2026-54130?

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

Is CVE-2026-54130 actively exploited?

Active exploitation of CVE-2026-54130 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-54130?

CVE-2026-54130 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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