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Wednesday, 28 October 2026
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Incident database

Command injection flaws in Microsoft Copilot and M365 Copilot (CVE-2026-41090, CVE-2026-42827)

Two command injection vulnerabilities were published for Microsoft's Copilot assistants: CVE-2026-41090 lets an unauthorized attacker perform tampering over a network in Microsoft Copilot, and CVE-2026-42827 lets an unauthorized attacker disclose information over a network in M365 Copilot. Both stem from improper neutralization of special elements used in a command.

Disclosed 22 May 2026 · Record updated 1 October 2026

Impact

Unauthenticated network attackers could tamper with data (Microsoft Copilot) or disclose information (M365 Copilot).

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-41090
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-42827