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CVE-2026-50517 Details
Description
Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.
A remote code execution vulnerability has been identified in Microsoft 365 Copilot. This issue arises from the deserialization of untrusted data, allowing an authorized attacker to execute code over the network. The vulnerability affects all users of the service.
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 Jul 24, 2026Exploitation: NoneAutomatable: NoTechnical Impact: Total
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50517 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-502 | Deserialization of Untrusted Data | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft 365 copilot | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 29, 2026 | Initial Analysis | [email protected] |
| Jul 25, 2026 | CVE Modified | CISA-ADP |
| Jul 24, 2026 | CVE Modified | CISA-ADP |
| Jul 24, 2026 | New CVE Received | [email protected] |