What is CVE-2026-41106?

CVE-2026-41106 is a critical-severity vulnerability in Microsoft 365 Copilot, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.3/10. Published 2026-07-02.

How severe is CVE-2026-41106?

Critical severity. CVSS v3 base score is 9.3 out of 10.

Open Redirect in Microsoft 365 Copilot

CVE-2026-41106

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

Vulnerability class: Open Redirect

Published 2026-07-02 · last modified 2026-07-07.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

Microsoft 365 Copilot Elevation of Privilege Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-41106?: CVE-2026-41106 is a critical-severity vulnerability in Microsoft 365 Copilot, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.3/10. Published 2026-07-02.
How severe is CVE-2026-41106?: Critical severity. CVSS v3 base score is 9.3 out of 10.