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.

Published 2026-05-07 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.009 (58.2th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

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.