CVE-2026-33102: Url redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate privilege
criticalvulnerabilityLLM-Specific
security
Summary
CVE-2026-33102 is an open redirect vulnerability (a flaw where a website redirects users to an untrusted site) in Microsoft 365 Copilot that allows an attacker to elevate their privileges over a network without authorization. The vulnerability has a CVSS severity rating of 4.0 (a moderate severity score on a 0-10 scale).
Vulnerability Details
CVSS Score
9.3(critical)
EPSS (30-day exploit probability)
EPSS: 0.0%
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Attack Vector
network
Attack Complexity
low
Privileges Required
none
User Interaction
required
Disclosure Date
April 23, 2026
Classification
Attack Type
Other
Attack SophisticationModerate
Impact (CIA+S)
integrity
AI Component TargetedAPI
Taxonomy References
CWE (Weakness Type)
Affected Vendors
Microsoft
Related Issues
Monthly digest — independent AI security research
Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-33102
First tracked: April 24, 2026 at 08:10 AM
Classified by LLM (prompt v3) · confidence: 85%