Affects widely-used Microsoft 365 Copilot; auth bypass could expose enterprise data.
CVE-2026-54130
Missing auth in M365 Copilot enables unauthorized data disclosure.
Is CVE-2026-54130 being exploited?
Not confirmed. CVE-2026-54130 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 1.1% probability of exploitation in the next 30 days.
How severe is CVE-2026-54130?
CVE-2026-54130 is rated Critical with a CVSS score of 9.8. 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-2026-54130?
Yes. A fix has been recorded for CVE-2026-54130. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-54130 affect?
CVE-2026-54130 affects Microsoft 365 Copilot. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-54130?
Restrict Copilot access; monitor activity; patch when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Auth bypass over network could read/exfiltrate Copilot data and sensitive responses.
Immediate action required