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Microsoft 365 Copilot EUVDEUVD-2026-82588

| CVE-2026-85885 HIGH
Command Injection (CWE-77)
2026-09-17 secure@microsoft.com GHSA-jjmx-rwxc-vwh4
8.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.8 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.8 HIGH

Network-reachable command injection needing low-privilege auth (PR:L) and no interaction; SSVC 'total' impact supports C:H/I:H/A:H; S:U retained per vendor vector though privilege elevation makes scope arguable.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

6
Analysis Updated
Sep 25, 2026 - 20:14 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 25, 2026 - 20:07 vuln.today
cvss_changed
Severity Changed
Sep 25, 2026 - 20:07 NVD
CRITICAL HIGH
CVSS changed
Sep 25, 2026 - 20:07 NVD
9.9 (CRITICAL) 8.8 (HIGH)
Analysis Generated
Sep 17, 2026 - 23:34 vuln.today
CVE Published
Sep 17, 2026 - 23:18 nvd
CRITICAL 9.9

DescriptionNVD

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an authorized attacker to elevate privileges over a network.

AnalysisAI

Command injection in Microsoft 365 Copilot lets an authenticated, low-privilege user with network access to the service inject special command elements into an input surface that fails to neutralize them (CWE-77), achieving total impact to confidentiality, integrity, and availability (CVSS 3.1 base 8.8, AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Because Copilot is a Microsoft-hosted SaaS offering, only tenants that have licensed and enabled Copilot are exposed, and remediation is applied server-side by Microsoft rather than by customer patching. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Impact
technique details hidden

Vulnerability AssessmentAI

Exploitation Requires an authenticated, low-privilege account with network access to Microsoft 365 Copilot (PR:L, AV:N, UI:N per CVSS) - it is not exploitable by fully unauthenticated outsiders. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, base 8.8) describes a network-reachable, low-complexity flaw requiring only low-privilege authentication and no user interaction, with total confidentiality/integrity/availability impact - consistent with CISA's SSVC 'Technical Impact: total'. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Because Microsoft 365 Copilot is delivered as a hosted SaaS service, there is no customer-side patch to install; Microsoft remediates by updating the service and the relevant guidance is tracked at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85885, so administrators should monitor that MSRC entry and their tenant Message Center for the service-side fix notification. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, confirm which tenants and user groups have Microsoft 365 Copilot licensed and enabled, restrict access to approved low-privilege users only, and review Microsoft 365 Copilot audit logs for anomalous command-like input or unexpected actions. …

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EUVD-2026-82588 vulnerability details – vuln.today

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