Microsoft Security Update Guide · Teams
Microsoft Teams for Android Information Disclosure Vulnerability
Published · updated 15 sep 2026
What does this mean?
- Information Disclosure. An attacker can see information that is not meant for them.
- It can be exploited over the network (including from the internet if the service is reachable there), with an ordinary user account and if a user takes part, for example by opening a link or file.
- CVSS 5.8 out of 10: medium. 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 Teams for Android: KBRelease Notes
1.0.0.2026142702
- Microsoft Teams for Android: KBRelease Notes
Origin validation error in Microsoft Teams for Android allows an authorized attacker to disclose information over a network.
How do I check if I am affected?
Update the app
- Update the app through the App Store, Google Play or the app's own automatic updates.
- If you manage devices with Intune, check in the Intune admin center which devices still run an older version.
Key facts
Released
8 sep 2026
Last revised
15 sep 2026 (v1.1)
Impact
Information Disclosure
Max severity
Important
Weakness
CVSS 3.1
5.8 / 5.1 (base / temporal)
Vector string
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:CPublicly disclosed
No
Exploited
No
Exploitability assessment
Exploitation Unlikely
Customer action required
Yes
Links
CVSS metrics
| Base score metrics | |
|---|---|
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | Low |
| User Interaction | Required |
| Scope | Changed |
| Confidentiality | High |
| Integrity | None |
| Availability | None |
| Temporal score metrics | |
| Exploit Code Maturity | Unproven |
| Remediation Level | Official Fix |
| Report Confidence | Confirmed |
Affected products and updates
| Product | Update | Build |
|---|---|---|
| Microsoft Teams for Android | KBRelease Notes · Security Update | 1.0.0.2026142702 |
FAQ
- What type of information could be disclosed by this vulnerability?
- This vulnerability could expose a sign-in access token for a user’s work account. If disclosed, that token could allow access to data and services that the user is authorized to use, potentially including sensitive organizational information.
- According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
- Successful exploitation of this vulnerability requires that the target system be set up in a specific manner and the attacker to have knowledge of that setup.
Revisions
| Version | Date | Note |
|---|---|---|
| 1.1 | 15 sep 2026 | Corrected fix build number. Informational change only. |
| 1 | 8 sep 2026 | Information published. |
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Source: Microsoft Security Update Guide. 365Fanatic is not affiliated with Microsoft.
