Widely used enterprise cloud service; data disclosure could impact many organizations.
CVE-2026-24307
Input validation flaw in M365 Copilot allows unauthorized data disclosure.
Is CVE-2026-24307 being exploited?
Not confirmed. CVE-2026-24307 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 0.84% probability of exploitation in the next 30 days.
How severe is CVE-2026-24307?
CVE-2026-24307 is rated Critical with a CVSS score of 9.3. 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-2026-24307?
Yes. A fix has been recorded for CVE-2026-24307. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-24307 affect?
CVE-2026-24307 affects Microsoft 365 Copilot. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-24307?
Monitor and apply patch when released; limit Copilot access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Network-based data exposure; attacker could exfiltrate sensitive information via Copilot input handling.
Immediate action required