CVE-2026-78501

HIGHCVSS 8.6

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.

Timeline

Published:September 17th, 2026 11:18 PM

Last modified:October 14th, 2026 11:19 PM

CVSS Scoring

CVSS v3: 8.6 (HIGH)

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

Affected Software

From NVD CPE configuration data

Vendors

microsoft

Products

365_copilot_chat

Weaknesses (CWE)

CWE-77 CWE-923

References & Reports

Advisories, patches, and third-party reports

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

Source: NIST NVD · Data may lag official sources by up to one minute