HighVulnerability

CVE-2026-78501: Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business…

Source: NVD(opens in a new tab)
Identifier: CVE-2026-78501
Published: September 17, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.5%

Summary

CVE-2026-78501 is an improper neutralization of special elements used in a command ('command injection') flaw in Microsoft 365 Copilot's Business Chat. An unauthorized attacker can exploit it over a network to disclose information.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 7.4(high)
CVSS vector: 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
EPSS: 0.5%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 4, 2026.
Disclosure date: September 17, 2026

Weaknesses and techniques

Weakness (CWE): CWE-77
CWE-923
Attack pattern (CAPEC): CAPEC-88

Affected

Vendors: Microsoft

Classification

Attack type: Other
Attack sophistication: Moderate
AI component targeted: API
Impact: Confidentiality
Labels: security,
privacy

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-78501

First tracked: September 17, 2026 at 08:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Topics

Coding assistants

Summary

Mitigation

Topics

Related items