# CVE-2026-54130: Microsoft 365 Copilot missing authentication for critical function

Source: https://junglewise.ai/threats/cve-2026-54130-microsoft-365-copilot-missing-authentication-for-critical  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-18. Updated: 2026-06-21  
License: CC BY 4.0 with a link back

CVE-2026-54130 · Severity: critical · CVSS 9.8 · Published 2026-06-18

A critical security flaw has been identified in Microsoft 365 Copilot, an AI-powered productivity tool integrated into Microsoft applications. This vulnerability allows an unauthorized person to access sensitive information over the network without needing a password or any special permissions. This could lead to the exposure of private corporate data and a complete compromise of the service's integrity and availability.

Technologies: [Microsoft 365 Copilot](https://junglewise.ai/threats/technologies/365-copilot). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-54130 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54130 being exploited in the wild.

**How severe is CVE-2026-54130?** Critical severity, with a CVSS score of 9.8, published 18 June 2026.

**Which products and versions are affected?** Microsoft 365 Copilot All versions.

**Is there a fix for CVE-2026-54130?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-54130 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-54130?** Check whether you run Microsoft 365 Copilot at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A missing authentication vulnerability (CWE-306) exists in Microsoft 365 Copilot. The flaw resides in a critical function that fails to verify the identity of the requester, allowing an unauthenticated attacker to invoke the function over a network. Successful exploitation grants the attacker the ability to disclose sensitive information and potentially achieve full control over the affected component's confidentiality, integrity, and availability. As this is an exclusively hosted service, Microsoft typically manages the deployment of fixes directly on the backend.

## Affected products

- Microsoft Microsoft 365 Copilot All versions

## Timeline

- 2026-06-18: disclosed
- 2026-06-18: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130)

## Related threats

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- [Microsoft M365 Copilot command injection privilege escalation](https://junglewise.ai/threats/cve-2026-85885-improper-neutralization-of-special-elements-used-in-a-command)
- [Microsoft 365 Copilot Business Chat command injection](https://junglewise.ai/threats/cve-2026-78501-microsoft-365-copilot-business-chat-command-injection)
- [Microsoft Copilot command injection in mobile applications](https://junglewise.ai/threats/cve-2026-48561-microsoft-copilot-command-injection-in-mobile-applications)
- [Microsoft M365 Copilot open redirect privilege escalation](https://junglewise.ai/threats/cve-2026-41106-microsoft-m365-copilot-open-redirect-privilege-escalation)