CVE-2026-26129
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Information Disclosure in Microsoft 365 Copilot
Publication date: 2026-05-07
Last updated on: 2026-05-08
Assigner: Microsoft Corporation
Description
Description
Improper neutralization of special elements in M365 Copilot allows an unauthorized attacker to disclose information over a network.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | 365_copilot_chat | * |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-138 | The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as control elements or syntactic markers when they are sent to a downstream component. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability involves improper neutralization of special elements in Microsoft 365 Copilot. It allows an unauthorized attacker to disclose information over a network.
How can this vulnerability impact me? :
The vulnerability can lead to unauthorized disclosure of sensitive information over a network, potentially exposing confidential data to attackers without requiring any user interaction or privileges.
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