What is CVE-2026-94510?

CVE-2026-94510 is a critical-severity vulnerability in Microsoft Bookings, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.9/10. Published 2026-10-08.

How severe is CVE-2026-94510?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Auth bypass in Microsoft Bookings

CVE-2026-94510

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

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-10-08 · last modified 2026-10-09.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Microsoft Bookings

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-94510 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-94510?: CVE-2026-94510 is a critical-severity vulnerability in Microsoft Bookings, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.9/10. Published 2026-10-08.
How severe is CVE-2026-94510?: Critical severity. CVSS v3 base score is 9.9 out of 10.