CVE-2026-41100

mediumpriority · track · 0EPSS 0.002 · 16 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.25% (16th) EPSS

CVSS 4.4 · medium

Is it mine?

24 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedMicrosoft 365 Copilot for Androidmsrc_csaf
16.0.19822.20190:Security Update:https://play.google.com/store/search?q=copilot+365&c=apps
https://play.google.com/store/search?q=copilot+365&c=apps
FixedMicrosoft Excel for Androidmsrc_csaf
16.0.19822.20190:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.excel&hl=en_US
https://play.google.com/store/apps/details?id=com.microsoft.office.excel&hl=en_US
FixedMicrosoft Loop for Androidmsrc_csaf
16.0.19822.20190:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.loop
https://play.google.com/store/apps/details?id=com.microsoft.loop
FixedMicrosoft OneNote for Androidmsrc_csaf
16.0.19822.20190:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.onenote
https://play.google.com/store/apps/details?id=com.microsoft.office.onenote
FixedMicrosoft PowerPoint for Androidmsrc_csaf
16.0.19822.20190:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.powerpoint&hl=en_US
https://play.google.com/store/apps/details?id=com.microsoft.office.powerpoint&hl=en_US
FixedMicrosoft Word for Androidmsrc_csaf
16.0.19822.20190:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.word&hl=en_US
https://play.google.com/store/apps/details?id=com.microsoft.office.word&hl=en_US

cvss

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

4.4

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.14.4mediumAV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.14.4mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:Csecondary · ENISA EU

v3.14.4mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · secure@microsoft.com USexploitability 1.8 · impact 2.5

v3.14.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.14.4mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/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-284USCWE-284USCWE-284US

affected products (24)

Products and version ranges known to be affected.

Microsoft 365 Copilot 365 Copilot's Business Chatall versionscert_bundDEcpe:/a:microsoft:365_copilot:365_copilots_business_chat
Microsoft 365 Copilot for Androidall versionscert_bundDEcpe:/a:microsoft:365_copilot:for_android
Microsoft 365 Copilot for Desktopall versionscert_bundDEcpe:/a:microsoft:365_copilot:for_desktop
Microsoft Word for Androidall versionscert_bundDEcpe:/a:microsoft:word:for_android
Microsoft Microsoft 365 Copilot for Android1.0 → 16.0.19822.20190enisa_euvdEU
Microsoft Microsoft Excel for Android16.0.0.0 → 16.0.19822.20190enisa_euvdEU
Microsoft Microsoft Loop for Android1.0.0 → 16.0.19822.20190enisa_euvdEU
Microsoft Microsoft OneNote for Android16.0.1 → 16.0.19822.20190enisa_euvdEU
Microsoft Microsoft PowerPoint for Android16.0.0.0 → 16.0.19822.20190enisa_euvdEU
Microsoft Microsoft Word for Android16.0.0.0 → 16.0.19822.20190enisa_euvdEU
Microsoft Corp Microsoft 365 Copilot≤ 16.0.19822.20190fstec_bduRU
Microsoft Microsoft 365 Copilot for Androidall versionsfixedmsrc_csafUS
Microsoft Microsoft 365 Copilot for Android< 16.0.19822.20190msrc_csafUS
Microsoft Microsoft Excel for Androidall versionsfixedmsrc_csafUS
Microsoft Microsoft Excel for Android< 16.0.19822.20190msrc_csafUS
Microsoft Microsoft Loop for Androidall versionsfixedmsrc_csafUS
Microsoft Microsoft Loop for Android< 16.0.19822.20190msrc_csafUS
Microsoft Microsoft OneNote for Androidall versionsfixedmsrc_csafUS
Microsoft Microsoft OneNote for Android< 16.0.19822.20190msrc_csafUS
Microsoft Microsoft PowerPoint for Androidall versionsfixedmsrc_csafUS

showing 20 of 24

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1484Microsoft Word für Android und 365 Copilot: Mehrere Schwachstellen ermöglichen Darstellen falscher InformationenDeutsch2026-05-12csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Microsoft Word für Android und Microsoft 365 Copilot ausnutzen, um falsche Informationen darzustellen.
msrc_CVE-2026-41100Microsoft 365 Copilot for Android Spoofing Vulnerability2026-05-12csaf · 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 msrc_csaf NVD CVE.org MITRE

published 2026-05-12modified 2026-10-26

references (3)

External citations — patches, advisories, analysis.

scry

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