PT-2026-55318 · Microsoft · M365 Copilot

Dan Reimer + 2 · Published 2026-07-02 · Updated 2026-07-03 · CVE-2026-41106

Positive Technologies (AI Summary)

CVSS v3.1

9.3

Critical

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions M365 Copilot (affected versions not specified)

Description M365 Copilot contains an open redirect issue, which occurs when an application redirects users to an untrusted external site. This flaw allows an unauthorized attacker to elevate privileges over a network.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Open Redirect

Weakness Enumeration

CWE-601

Related Identifiers

CVE-2026-41106

Affected Products

M365 Copilot

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-41106 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41106 · Vendor Advisory
• https://twitter.com/CVEnew/status/2072814562089504867 · Twitter Post
• https://twitter.com/UpwindMDR/status/2072944328947720461 · Twitter Post