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Vulnerability record · CVE-2026-78501 · published 17 September 2026

CVE-2026-78501: Command injection vulnerability

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.

7.4 CVSS 3.1 High EPSS 0.89% · top 42.2% CWE-77 · Command injectionCWE-923 · CWE-923 Awaiting Analysis
7.4CVSS 3.1 base score
0.89%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
18 Sep 2026Last modified by NVD

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-78501), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.