Vulnerability

CVE-2026-42824

Medium· 6.5CVSS6.5EPSS0%

.rules3/5

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Threat signal

65/100

Elevated

Severity

medium

CVSS

6.5

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

6.5/ 10MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionRequiredRequires user action (click, file open, etc).
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactNoneNo integrity impact.
Availability ImpactNoneNo availability impact.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.07%

probability of exploitation in next 30 days

p22

higher than 22% of all CVEs

3-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-42824. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCDefer

No exploitation, limited impact or prevalence

exploitation: none
automatable: no
impact: partial
mission: support

Lifecycle

2026-06-04Vendor advisory · microsoftCVE-2026-42824 — M365 Copilot Information Disclosure Vulnerability
2026-06-04Published
2026-06-08Last modified1 source

Entity graph

2 nodes · 1 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

microsoftCVE-2026-42824M365 Copilot Information Disclosure Vulnerability

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42824

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.