CVE-2026-26123: CWE-939: Improper Authorization in Handler for Custom URL Scheme in Microsoft Microsoft Authenticator for Android
Cwe is not in rca categories in Microsoft Authenticator allows an unauthorized attacker to disclose information locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-26123) affects Microsoft Authenticator for Android version 6.0.0. It is classified as CWE-939 (Improper Authorization) and arises from the application's handler for a custom URL scheme. Due to improper authorization checks, an unauthorized attacker can cause local information disclosure. The CVSS 3.1 vector indicates the attack requires local access with low complexity, no privileges, and user interaction, impacting confidentiality but not integrity or availability. Microsoft has released an official fix for this issue.
Potential Impact
An unauthorized attacker with local access and the ability to trigger the custom URL scheme handler can disclose sensitive information on the affected device. The confidentiality impact is high, while integrity and availability are not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the update to Microsoft Authenticator for Android version 6.0.0 or later as provided in the Microsoft security advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26123. No additional mitigation actions are indicated by the vendor.
CVE-2026-26123: CWE-939: Improper Authorization in Handler for Custom URL Scheme in Microsoft Microsoft Authenticator for Android
Description
Cwe is not in rca categories in Microsoft Authenticator allows an unauthorized attacker to disclose information locally.
CVSS v3.1
Score 5.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-26123) affects Microsoft Authenticator for Android version 6.0.0. It is classified as CWE-939 (Improper Authorization) and arises from the application's handler for a custom URL scheme. Due to improper authorization checks, an unauthorized attacker can cause local information disclosure. The CVSS 3.1 vector indicates the attack requires local access with low complexity, no privileges, and user interaction, impacting confidentiality but not integrity or availability. Microsoft has released an official fix for this issue.
Potential Impact
An unauthorized attacker with local access and the ability to trigger the custom URL scheme handler can disclose sensitive information on the affected device. The confidentiality impact is high, while integrity and availability are not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the update to Microsoft Authenticator for Android version 6.0.0 or later as provided in the Microsoft security advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26123. No additional mitigation actions are indicated by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-02-11T15:52:13.911Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26123","vendor":"Microsoft"}]
Threat ID: 69b071392f860ef943a5fd50
Added to database: 03/10/2026, 19:30:01 UTC
Last enriched: 06/19/2026, 20:31:26 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 178
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