Executive brief
Microsoft Teams for Android is a messaging and collaboration application used by millions of employees worldwide. An origin validation flaw allows an authorized attacker to bypass security controls and access or disclose sensitive information through the network without further user interaction.
Technical details
The vulnerability is an origin validation error in Microsoft Teams for Android that fails to properly verify the source of requests or data. This validation bypass allows an authorized attacker with network access to disclose information by circumventing origin-based security controls. The attack requires prior authentication to the Teams application. The vulnerability can be exploited over the network without additional user interaction beyond the initial authorization. A patch is expected to be available through Microsoft's regular security update cycle.
Affected products
- Microsoft Teams for Android <UNKNOWN>
Timeline
- 2026-09-08: disclosed