Microsoft Security Update Guide · Teams
Microsoft Teams Remote Code Execution Vulnerability
Published · updated 16 aug 2026
What does this mean?
- Remote Code Execution. An attacker can run their own code on the system remotely. This is the most serious type: it can lead to taking over the system.
- It can be exploited over the network (including from the internet if the service is reachable there), without an account and if a user takes part, for example by opening a link or file.
- CVSS 8.8 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 Teams for Android: KBRelease Notes
1.0.0.2026133602
- Microsoft Teams for Android: KBRelease Notes
Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft Teams for Android allows an unauthorized attacker to execute code 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.
What kind of flaw is this?
- CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
With a crafted path an attacker can read or write files outside the intended folder (path traversal).
Key facts
Released
11 aug 2026
Last revised
16 aug 2026 (v1.1)
Impact
Remote Code Execution
Max severity
Important
Weakness
CVSS 3.1
8.8 / 7.7 (base / temporal)
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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 | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| 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 Teams for Android | KBRelease Notes · Security Update | 1.0.0.2026133602 |
FAQ
- According to the CVSS metric, the attack vector is network (AV:N) and user interaction is required (UI:R). What is the target context of the remote code execution?
- This attack requires a user to open a specially crafted file from the attacker to initiate remote code execution.
Revisions
| Version | Date | Note |
|---|---|---|
| 1.1 | 16 aug 2026 | Corrected build number for the security update. This in an informational change only. |
| 1 | 11 aug 2026 | Information published. |
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Source: Microsoft Security Update Guide. 365Fanatic is not affiliated with Microsoft.
