What is CVE-2026-69559?

CVE-2026-69559 is a medium-severity vulnerability in Microsoft Teams For Android, classified under Origin Validation Error. CVSS score: 5.8/10. Published 2026-09-08.

How severe is CVE-2026-69559?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Vulnerability in Microsoft Teams For Android

CVE-2026-69559

Origin validation error in Microsoft Teams for Android allows an authorized attacker to disclose information over a network.

Published 2026-09-08 · last modified 2026-09-29.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.8th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

Microsoft Teams for Android Information Disclosure Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-69559?: CVE-2026-69559 is a medium-severity vulnerability in Microsoft Teams For Android, classified under Origin Validation Error. CVSS score: 5.8/10. Published 2026-09-08.
How severe is CVE-2026-69559?: Medium severity. CVSS v3 base score is 5.8 out of 10.