Vulnerability in Microsoft Bookings

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.9

[ Description ]Official description

Authorization bypass through user-controlled key in Microsoft Bookings allows an unauthorized attacker to elevate privileges over a network.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund13 Oct 2026WID-SEC-2026-3922

  Microsoft Apps: Multiple vulnerabilities Translated from German

  CVE-2026-83844CVE-2026-92707CVE-2026-96188+3 more CVEs
• NCSC-NL13 Oct 2026NCSC-2026-0423

  Vulnerabilities fixed in Microsoft Windows Translated from Dutch

  Probability/damage M/HCVE-2026-100202CVE-2026-100219CVE-2026-100222+49 more CVEs

[ References ]References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-94510