CVE-2026-78501
highImproper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to…
Vendor / product: Microsoft — 365 copilot chat
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
8.6
8.6 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Severity source: NVD CVSS v3.1 (secure@microsoft.com)
Timeline (UTC)
Published: 2026-09-17 23:18
Modified: 2026-10-14 23:19
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 06:54 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
microsoft / 365_copilot_chat all versions
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78501
Patch / mitigation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78501
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78501 secure@microsoft.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:54 UTC · record ↗