CVE-2026-55145

highpriority · track · 28EPSS 0.005 · 44 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.53% (44th) EPSS

CVSS 7.1 · high

Is it mine?

10 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Improper neutralization of special elements used in a command ('command injection') in Outlook Copilot allows an authorized attacker to perform tampering over a network.

cvss

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

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.3–7.1

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 4.2

v3.16.3mediumAV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.16.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N/E:P/RL:O/RC:Csecondary · ENISA EU

v3.16.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:Nsecondary · secure@microsoft.com USexploitability 2.1 · impact 4.2

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.16.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N/E:P/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-77USCWE-77US

affected products (10)

Products and version ranges known to be affected.

Microsoft 365 Copilot 365 Copilot's Business Chatall versionscert_bundDEcpe:/a:microsoft:365_copilot:-
Microsoft 365 Copilot Outlookall versionscert_bundDEcpe:/a:microsoft:365_copilot:outlook
Microsoft 365 Copilot for Androidall versionscert_bundDEcpe:/a:microsoft:365_copilot:for_android
Microsoft 365 Copilot for iOSall versionscert_bundDEcpe:/a:microsoft:365_copilot:for_ios
Microsoft GitHub Copilot Plugin for JetBrains IDEsall versionscert_bundDEcpe:/a:microsoft:github_copilot:plugin_for_jetbrains_ides
Microsoft Windows Terminal for Windows 10all versionscert_bundDEcpe:/a:microsoft:windows_terminal:for_windows_10
Microsoft Windows Terminal for Windows 11all versionscert_bundDEcpe:/a:microsoft:windows_terminal:for_windows_11
Microsoft Microsoft Copilotall versionsenisa_euvdEU
Microsoft Corp Microsoft Copilotall versionsfstec_bduRU
microsoft copilotall versionsnvdUScpe:2.3:a:microsoft:copilot:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2320Microsoft Windows Terminal, 365 Copilot, Github Copilot: Mehrere SchwachstellenDeutsch2026-07-14csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Microsoft Windows Terminal, 365 Copilot und Github Copilotausnutzen, um beliebigen Programmcode auszuführen, um falsche Informationen darzustellen und um seine Privilegien zu erhöhen.
msrc_CVE-2026-55145Outlook Copilot Tampering Vulnerability2026-07-14csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd msrc_csaf NVD CVE.org MITRE

published 2026-07-14modified 2026-10-24

references (3)

External citations — patches, advisories, analysis.

scry

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