SB2026031078 - Information disclosure in Microsoft Authenticator
Published: March 10, 2026
Security Bulletin ID
SB2026031078
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Authorization in Handler for Custom URL Scheme (CVE-ID: CVE-2026-26123)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to improper authorization in handler for custom URL scheme in Microsoft Authenticator. A remote attacker can gain access to sensitive information if the user selects a malicious application as the handler for the sign‑in deep link.
Remediation
Install update from vendor's website.