CVE-2026-41106 — 365 Copilot
CRITICALCVE-2026-41106 is a critical-severity (CVSS 9.3) Open Redirect vulnerability in microsoft 365 copilot. No vendor fix is recorded yet; mitigation options are listed below.
Url redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate privileges over a network.
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-41106.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-41106 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Description
Url redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate privileges over a network.
Affected Products
365 copilotmicrosoftDetection & mitigation playbook
Vendor / applianceDetect
Inventory every microsoft 365 copilot deployment and check each version against the affected-products list above.
Remediation status
No patch has shipped for CVE-2026-41106 yet — track the microsoft 365 copilot advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2026-41106 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.