CVE-2026-42827: CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') in Microsoft Microsoft 365 Copilot
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-42827) involves improper neutralization of special elements in commands within Microsoft 365 Copilot, enabling unauthorized attackers to perform command injection that leads to information disclosure over a network. The vulnerability is rated medium severity with a CVSS 3.1 score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N). Microsoft has released an official fix and manages remediation for this cloud service. No known active exploitation has been reported.
Potential Impact
An attacker can exploit this vulnerability to disclose sensitive information over the network without requiring privileges, potentially compromising confidentiality. There is no impact on integrity or availability reported.
Mitigation Recommendations
Microsoft has provided an official fix for this vulnerability and manages remediation for the Microsoft 365 Copilot cloud service. Users should ensure their service is updated according to Microsoft's guidance available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42827. No additional user action is required beyond applying the official fix.
CVE-2026-42827: CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') in Microsoft Microsoft 365 Copilot
Description
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
CVSS v3.1
Score 6.5medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-42827) involves improper neutralization of special elements in commands within Microsoft 365 Copilot, enabling unauthorized attackers to perform command injection that leads to information disclosure over a network. The vulnerability is rated medium severity with a CVSS 3.1 score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N). Microsoft has released an official fix and manages remediation for this cloud service. No known active exploitation has been reported.
Potential Impact
An attacker can exploit this vulnerability to disclose sensitive information over the network without requiring privileges, potentially compromising confidentiality. There is no impact on integrity or availability reported.
Mitigation Recommendations
Microsoft has provided an official fix for this vulnerability and manages remediation for the Microsoft 365 Copilot cloud service. Users should ensure their service is updated according to Microsoft's guidance available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42827. No additional user action is required beyond applying the official fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-30T14:51:12.703Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42827","vendor":"Microsoft"}]
Threat ID: 6a10d8e7e1370fbb485de148
Added to database: 05/22/2026, 22:29:59 UTC
Last enriched: 06/22/2026, 14:33:30 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 110
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