MSRC-CVE-2026-33102 — Microsoft 365 Copilot Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Critical. Not known to be exploited. Customer action: Not required.

Details

Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?
This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency.
Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.

Vulnerabilities 1

Critical 9.3

CVE-2026-33102

Microsoft 365 Copilot Elevation of Privilege Vulnerability

Url redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate privileges over a network.

Microsoft Microsoft 365 Copilot

Apr 23, 2026

Revision history

2026-04-23 #1
Information published.

References

CVE-2026-33102 Microsoft 365 Copilot Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33102
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss