CVE-2026-26123: Microsoft Authenticator Information Disclosure Vulnerability

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-10 · updated 2026-06-19
Weakness: CWE-939

Description

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

Affected products

Microsoft Authenticator for Android: before 6.8.40; before 6.2511.7533 — fixed in 6.2511.7533, 6.8.40
Microsoft Authenticator for Android: from 6.0.0 before 6.2511.7533 — fixed in 6.2511.7533
Microsoft Authenticator for IOS: from 6.0.0 before 6.8.40 — fixed in 6.8.40

How to fix

Upgrade to a fixed version: Microsoft Authenticator for Android 6.2511.7533, 6.8.40; Microsoft Authenticator for Android 6.2511.7533; Microsoft Authenticator for IOS 6.8.40. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26123

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