CVE-2026-33102
Critical
Description
Url redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate privileges over a network.
SeverityCritical
CVSS9.3
Exploit probability—
Product
Microsoft 365 Copilot
PublishedApr 23, 2026
First seenApr 23, 2026
Weakness typeCWE-601Open redirect
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft 365_copilot | No range specified | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.