CVE-2026-47645
Open redirect in Microsoft 365 Copilot Business Chat enables privilege escalation.
Is CVE-2026-47645 being exploited?
Not confirmed. CVE-2026-47645 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.76% probability of exploitation in the next 30 days.
How severe is CVE-2026-47645?
CVE-2026-47645 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-47645?
Yes. A fix has been recorded for CVE-2026-47645. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-47645 affect?
CVE-2026-47645 affects Microsoft 365 Copilot - Business Chat. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-47645?
Monitor advisories; patch when available; limit/validate redirects
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Open redirect could allow an attacker to escalate privileges by abusing trusted redirects in Business Chat.
Immediate action required