CVE-2026-26129 Details
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.
A vulnerability in Microsoft 365 Copilot's Business Chat feature allows unauthorized attackers to disclose information over a network. This issue arises from improper neutralization of special elements, creating a potential for information leakage.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 8, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-138 | Improper Neutralization of Special Elements | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft 365 copilot chat | All versions |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 1, 2026 | CVE Modified | [email protected] |
| May 8, 2026 | Initial Analysis | [email protected] |
| May 7, 2026 | New CVE Received | [email protected] |