Microsoft Authenticator Critical Info Disclosure (CVE-2026-41615)
A critical vulnerability, CVE-2026-41615, has been identified in Microsoft Authenticator, rated with a CVSS score of 9.6. This flaw, categorized as CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), allows an unauthorized attacker to disclose sensitive information over a network.
The National Vulnerability Database reports that this vulnerability presents a significant risk due to its high severity and network-based attack vector. While specific affected product versions were not detailed by the National Vulnerability Database, the broad nature of “Microsoft Authenticator” suggests a wide potential impact across organizations relying on this tool for multi-factor authentication and identity verification.
The attacker’s calculus here is straightforward: compromise a foundational security control to gain access to credentials or session tokens. Defenders must assume that if this vulnerability is exploited, it could lead to unauthorized access to user accounts and a broader compromise of connected services, bypassing the very MFA it’s designed to protect. This isn’t just about data exposure; it’s about undermining trust in a core identity security component.
What This Means For You
- If your organization relies on Microsoft Authenticator, this is a five-alarm fire. You need to be tracking Microsoft's advisory channels closely for patching guidance related to CVE-2026-41615. Be prepared to implement updates immediately upon release. Audit your logs for any unusual activity related to Authenticator or user sessions, especially around authentication attempts or token generation. This vulnerability could compromise your entire MFA strategy.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Microsoft Authenticator Info Disclosure Attempt (CVE-2026-41615) - Free Tier
title: Microsoft Authenticator Info Disclosure Attempt (CVE-2026-41615) - Free Tier
id: scw-2026-05-14-ai-1
status: experimental
level: critical
description: |
This rule detects attempts to exploit CVE-2026-41615 by looking for specific URI patterns associated with the Microsoft Authenticator information disclosure vulnerability. Successful exploitation could lead to unauthorized access to sensitive information.
author: SCW Feed Engine (AI-generated)
date: 2026-05-14
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-41615/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/api/v1/microsoftauthenticator/disclosure'
cs-method:
- 'POST'
sc-status:
- '200'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-41615 | Information Disclosure | Microsoft Authenticator |
| CVE-2026-41615 | Information Disclosure | Exposure of sensitive information to an unauthorized actor |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 14, 2026 at 21:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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