CVE-2026-42824

highpriority · track · 33EPSS 0.076 · 95 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

7.64% (95th) EPSS

CVSS 7.5 · high

Is it mine?

7 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · msrc_csaf

EPSS · scored 2026-10-27

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

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.5–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:Csecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:Nsecondary · secure@microsoft.com USexploitability 2.8 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-77USCWE-77US

affected products (7)

Products and version ranges known to be affected.

Microsoft 365 Copilot 365 Copilot's Business Chatall versionscert_bundDEcpe:/a:microsoft:365_copilot:-
Microsoft Azure HorizonDBall versionscert_bundDEcpe:/a:microsoft:azure:horizondb
Microsoft Edge Copilot Chatall versionscert_bundDEcpe:/a:microsoft:edge:copilot_chat
Microsoft Exchange Onlineall versionscert_bundDEcpe:/a:microsoft:exchange:online
Microsoft Microsoft 365 Copilotall versionsenisa_euvdEU
Microsoft Microsoft 365 Copilotall versionsfixedmsrc_csafUS
microsoft copilotall versionsnvdUScpe:2.3:a:microsoft:copilot:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1792Microsoft Clouddienste: Mehrere Schwachstellen ermöglichen PrivilegieneskalationDeutsch2026-06-04csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in verschiedenen Microsoft Clouddiensten wie Azure HorizonDB, Exchange Online, 365 Copilot und dem Copilot Chat in Edge ausnutzen, um seine Privilegien zu erweitern, um beliebigen Code auszuführen und um Informationen offenzulegen.
msrc_CVE-2026-42824M365 Copilot Information Disclosure Vulnerability2026-06-04csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund msrc_csaf nvd NVD CVE.org MITRE

published 2026-06-04modified 2026-07-23

references (3)

External citations — patches, advisories, analysis.

scry

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