What is CVE-2026-62896?

CVE-2026-62896 is a critical-severity vulnerability in Microsoft Teams, classified under Improper Authentication. CVSS score: 9.6/10. Published 2026-08-07.

How severe is CVE-2026-62896?

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

Auth bypass in Microsoft Teams

CVE-2026-62896

Improper authentication in Microsoft Teams allows an authorized attacker to elevate privileges over a network.

Vulnerability class: Broken Authentication

Published 2026-08-07 · last modified 2026-10-24.

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: 0.007 (52.8th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62896 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-62896?: CVE-2026-62896 is a critical-severity vulnerability in Microsoft Teams, classified under Improper Authentication. CVSS score: 9.6/10. Published 2026-08-07.
How severe is CVE-2026-62896?: Critical severity. CVSS v3 base score is 9.6 out of 10.