Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
6DescriptionNVD
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
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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Same weakness CWE-77 – Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-82588
GHSA-jjmx-rwxc-vwh4