Microsoft Security Update Guide · Entra
Microsoft Authenticator Elevation of Privilege Vulnerability
Published · updated 15 sep 2026
What does this mean?
- Elevation of Privilege. An attacker can gain more rights than they should have, for example admin rights.
- It can be exploited with access to the device itself, without an account and if a user takes part, for example by opening a link or file.
- CVSS 8.6 out of 10: high. Microsoft rates it Important.
- No attacks reported; Microsoft expects exploitation to be less likely.
- What should you do? Install the security update for the version you run (or a later cumulative update):
- Microsoft Authenticator for Android: KBRelease Notes
6.2606.4246
- Microsoft Authenticator for Android: KBRelease Notes
Improper authentication in Microsoft Authenticator allows an unauthorized attacker to elevate privileges locally.
What kind of flaw is this?
- CWE-287: Improper Authentication
The software does not properly check who a user is (authentication).
Key facts
Released
8 sep 2026
Last revised
15 sep 2026 (v1.1)
Impact
Elevation of Privilege
Max severity
Important
Weakness
CVSS 3.1
8.6 / 7.5 (base / temporal)
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:CPublicly disclosed
No
Exploited
No
Exploitability assessment
Exploitation Less Likely
Customer action required
Yes
Links
CVSS metrics
| Base score metrics | |
|---|---|
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Changed |
| Confidentiality | High |
| Integrity | High |
| Availability | High |
| Temporal score metrics | |
| Exploit Code Maturity | Unproven |
| Remediation Level | Official Fix |
| Report Confidence | Confirmed |
Affected products and updates
| Product | Update | Build |
|---|---|---|
| Microsoft Authenticator for Android | KBRelease Notes · Security Update | 6.2606.4246 |
FAQ
- What privileges could be gained by an attacker who successfully exploited the vulnerability?
- An attacker who successfully exploited this vulnerability could potentially gain the ability to authenticate against a remote host using the current user’s credentials.
- How could an attacker exploit this vulnerability?
- An attacker could exploit this vulnerability by installing and running a malicious application on an affected Android device and convincing the user to complete an authentication flow in Microsoft Authenticator. Successful exploitation could allow the attacker to obtain authentication tokens and access resources as the affected user.
Revisions
| Version | Date | Note |
|---|---|---|
| 1.1 | 15 sep 2026 | Corrected fix build number. Informational change only. |
| 1 | 8 sep 2026 | Information published. |
This is in the weekly digest for week 38 · What changed this week? →
View at Microsoft → ← All security advisories
Source: Microsoft Security Update Guide. 365Fanatic is not affiliated with Microsoft.
