What is CVE-2026-26123?

CVE-2026-26123 is a medium-severity vulnerability in Microsoft Authenticator, classified under CWE-939. CVSS score: 5.5/10. Published 2026-03-10.

How severe is CVE-2026-26123?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Microsoft Authenticator

CVE-2026-26123

Cwe is not in rca categories in Microsoft Authenticator allows an unauthorized attacker to disclose information locally.

Published 2026-03-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.4th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: -0.000

Affected products

Microsoft Authenticator
Microsoft Authenticator For Android — versions 6.0.0
Microsoft Authenticator For iOS — versions 6.0.0

Weakness classification (CWE)

CWE-939

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26123 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-26123?: CVE-2026-26123 is a medium-severity vulnerability in Microsoft Authenticator, classified under CWE-939. CVSS score: 5.5/10. Published 2026-03-10.
How severe is CVE-2026-26123?: Medium severity. CVSS v3 base score is 5.5 out of 10.