CVE-2026-85887: CWE-732: Incorrect Permission Assignment for Critical Resource in Microsoft Microsoft 365 Copilot
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
AI Analysis
Technical Summary
CVE-2026-85887 is classified under CWE-732 (Incorrect Permission Assignment for Critical Resource) affecting Microsoft 365 Copilot. The vulnerability permits an authorized attacker with low privileges to gain unauthorized read access to sensitive information over the network. The CVSS v3.1 base score is 7.7, indicating high severity, with vector AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N. Microsoft has issued an official fix, and as a cloud service, remediation is handled server-side by Microsoft.
Potential Impact
An authorized attacker with low privileges can disclose sensitive information over the network due to improper permission assignment. The confidentiality impact is high, but integrity and availability are not affected. No known exploitation in the wild has been reported.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. As Microsoft 365 Copilot is a cloud-hosted service, the vendor manages remediation server-side. Users should ensure their service is up to date and follow any guidance provided by Microsoft in their advisory.
CVE-2026-85887: CWE-732: Incorrect Permission Assignment for Critical Resource in Microsoft Microsoft 365 Copilot
Description
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
CVSS v3.1
Score 7.7high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-85887 is classified under CWE-732 (Incorrect Permission Assignment for Critical Resource) affecting Microsoft 365 Copilot. The vulnerability permits an authorized attacker with low privileges to gain unauthorized read access to sensitive information over the network. The CVSS v3.1 base score is 7.7, indicating high severity, with vector AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N. Microsoft has issued an official fix, and as a cloud service, remediation is handled server-side by Microsoft.
Potential Impact
An authorized attacker with low privileges can disclose sensitive information over the network due to improper permission assignment. The confidentiality impact is high, but integrity and availability are not affected. No known exploitation in the wild has been reported.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. As Microsoft 365 Copilot is a cloud-hosted service, the vendor manages remediation server-side. Users should ensure their service is up to date and follow any guidance provided by Microsoft in their advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-04T18:18:19.327Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Gcve Source
- db.gcve.eu
Threat ID: 6aac8d4f55bf5e2cf5474282
Added to database: 09/18/2026, 01:01:03 UTC
Last enriched: 09/18/2026, 01:06:34 UTC
Last updated: 09/18/2026, 02:21:05 UTC
Views: 4
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