CVE-2026-26133 | M365 Copilot Information Disclosure Vulnerability

AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Published: 2026-03-16 Last update: 2026-04-09 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-26133 is rated Moderate Risk (40.8/100): CVSS High severity, with low exploitation likelihood (EPSS 0.43%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-26133

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.05% 0.43% +0.38%
2 2026-05-20 0.05% 0.05% +0.01%
3 2026-04-21 — 0.05% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-26133

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 4.2 [email protected]

Weakness enumeration for CVE-2026-26133

Affected software / configurations for CVE-2026-26133

Vendor Product Version Raw CPE
microsoft 365_copilot < 2.107.2 cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:iphone_os:*:*
microsoft 365_copilot < 16.0.19815.10000 cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:android:*:*
microsoft edge < 145.3800.99 cpe:2.3:a:microsoft:edge:*:*:*:*:*:android:*:*
microsoft edge < 145.3800.99 cpe:2.3:a:microsoft:edge:*:*:*:*:*:iphone_os:*:*
microsoft excel < 2.106.2 cpe:2.3:a:microsoft:excel:*:*:*:*:*:iphone_os:*:*
microsoft excel < 16.0.19822.20038 cpe:2.3:a:microsoft:excel:*:*:*:*:*:android:*:*
microsoft loop < 2.106 cpe:2.3:a:microsoft:loop:*:*:*:*:*:iphone_os:*:*
microsoft onenote < 16.0.19725.20142 cpe:2.3:a:microsoft:onenote:*:*:*:*:*:android:*:*
microsoft onenote — cpe:2.3:a:microsoft:onenote:-:*:*:*:*:iphone_os:*:*
microsoft outlook < 5.2605.0 cpe:2.3:a:microsoft:outlook:*:*:*:*:*:android:*:*
microsoft outlook < 5.2605.0 cpe:2.3:a:microsoft:outlook:*:*:*:*:*:iphone_os:*:*
microsoft outlook — cpe:2.3:a:microsoft:outlook:-:*:*:*:*:macos:*:*
microsoft power_bi < 2.2.260210.21290750 cpe:2.3:a:microsoft:power_bi:*:*:*:*:*:android:*:*
microsoft power_bi — cpe:2.3:a:microsoft:power_bi:-:*:*:*:*:iphone_os:*:*
microsoft powerpoint < 2.106.2 cpe:2.3:a:microsoft:powerpoint:*:*:*:*:*:iphone_os:*:*
microsoft powerpoint < 16.0.19822.20038 cpe:2.3:a:microsoft:powerpoint:*:*:*:*:*:android:*:*
microsoft teams < 1.0.0.2026043102 cpe:2.3:a:microsoft:teams:*:*:*:*:*:android:*:*
microsoft teams < 8.3.1 cpe:2.3:a:microsoft:teams:*:*:*:*:*:iphone_os:*:*
microsoft word < 2.106.2 cpe:2.3:a:microsoft:word:*:*:*:*:*:iphone_os:*:*
microsoft word < 16.0.19822.20038 cpe:2.3:a:microsoft:word:*:*:*:*:*:android:*:*

References for CVE-2026-26133

cvelogic Threat Intelligence