What is CVE-2026-33823?

CVE-2026-33823 is a critical-severity vulnerability in Microsoft Teams, classified under Improper Authorization. CVSS score: 9.6/10. Published 2026-05-07.

How severe is CVE-2026-33823?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Auth bypass in Microsoft Teams

CVE-2026-33823

Improper authorization in Microsoft Teams allows an authorized attacker to disclose information over a network.

EPSS: 0.001 (24.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

Affected products

Microsoft Teams
Microsoft Teams

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

Microsoft Team Events Portal Information Disclosure Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33823?: CVE-2026-33823 is a critical-severity vulnerability in Microsoft Teams, classified under Improper Authorization. CVSS score: 9.6/10. Published 2026-05-07.
How severe is CVE-2026-33823?: Critical severity. CVSS v3 base score is 9.6 out of 10.