CVE-2026-48561 365 copilot vulnerability
Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to execute code over a network.
Quick answer
microsoft 365 copilot should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- -
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-48561 affects Microsoft 365 Copilot. The issue can let an attacker run commands through unsafe input handling. Apply Microsoft updates and restrict risky Copilot integrations until patched.
- Apply the Microsoft 365 or Copilot security update that fixes CVE-2026-48561.
- Review Copilot connectors, plugins, and automation rules that can reach internal data or systems.
- Limit Copilot access to the least permissions needed for each user group.
- Check audit logs for strange prompts, connector calls, or unexpected command-like activity.
- Keep security monitoring enabled for Microsoft 365, Entra ID, and endpoint alerts.
Scan now. Google sign-in is only needed to unlock fix guidance.
Verify the fix
- Confirm the tenant shows the Microsoft fix as applied or no longer vulnerable.
- Run a fresh security review of Copilot connectors and permissions.
- Confirm no new suspicious Copilot or connector activity appears in audit logs.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-48561?
microsoft 365 copilot versions listed as affected should be reviewed: -.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.