CVE-2026-26133
M365 Copilot Information Disclosure Vulnerability
HIGH
7.1
CVSS Score
Published: March 13, 2026 at 09:10 PM UTC
Updated: June 17, 2026 at 10:25 AM UTC
12 products affected across 1 vendorEdgeExcelWord
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Severity
HIGH7.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit
Description
AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 16.0.19815.10000, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.107.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 145.3800.99, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.19822.20038, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.106.26020617, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.106.26020617, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.19725.20142, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.106.26020617, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2605, so it looks safe — our inference, not a vendor statement
1.0 ≤ v < 5.2605
Affected range stops below 5.2605, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.2.260302.2193910, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.2.260210.21290750, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.19822.20038, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.106.26020617, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.0.0.2026043102, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.3.1, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26133SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.1HIGHmicrosoft
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-77
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