CVE-2026-26129

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-26129
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

7.5 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129 Vendor Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:microsoft:365_copilot_chat:-:*:*:*:*:*:*:*
History

01 Jun 2026, 19:16

Type Values Removed Values Added
Summary (en) Improper neutralization of special elements in M365 Copilot allows an unauthorized attacker to disclose information over a network. (en) Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

08 May 2026, 19:53

Type Values Removed Values Added
References () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129 - () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129 - Vendor Advisory
CPE cpe:2.3:a:microsoft:365_copilot_chat:-:*:*:*:*:*:*:*
First Time Microsoft
Microsoft 365 Copilot Chat

07 May 2026, 22:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-07 22:16

Updated : 2026-06-01 19:16

NVD link : CVE-2026-26129

Mitre link : CVE-2026-26129

CVE.ORG link : CVE-2026-26129

JSON object : View

Products Affected

microsoft

  • 365_copilot_chat
CWE
CWE-138

Improper Neutralization of Special Elements