Product:
M365 Copilot
Summary
Improper neutralization of special elements in output used by a downstream component in M365 Copilot allows an unauthorized attacker to disclose information over a network. This vulnerability can lead to significant confidentiality breaches if exploited. Attackers can leverage this flaw to gain access to sensitive information.
Details
| Severity | Base Score | CVE |
|---|---|---|
| HIGH | 7.5 | CVE-2026-26164 |
Exploitation
To exploit this vulnerability, an attacker can craft a malicious input that is processed by M365 Copilot. By injecting specially crafted data, the attacker can manipulate the output to disclose sensitive information over the network. This can be done without requiring any privileges or user interaction, making it a low-complexity attack.
Affected Products
- M365 Copilot: Affected by improper neutralization of special elements, allowing unauthorized information disclosure.
Mitigation
To mitigate this vulnerability, it is recommended to apply the latest security updates provided by Microsoft. Additionally, organizations should implement strict input validation and output encoding practices to prevent injection attacks. Regular security assessments can also help identify and remediate potential vulnerabilities.