CVE-2026-78501 — HIGH (7.4)

Vulnerability Description

Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.

CVSS Score

7.4

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Related Weaknesses (CWE)

CWE-923 CWE-77

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78501

FAQ

What is CVE-2026-78501?

CVE-2026-78501 is a vulnerability with a CVSS score of 7.4 (HIGH). Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.

How severe is CVE-2026-78501?

CVE-2026-78501 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-78501?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.