A one-click attack targeting GitHub.dev, the browser-based VS Code environment, allows an attacker to steal a victim’s GitHub OAuth token simply by having them click a crafted link. The stolen token grants full read and write access to both public and private repositories. This is particularly dangerous because it requires no malware installation and exploits a legitimate GitHub feature.

Architect’s Take: Audit OAuth token scopes granted to GitHub.dev within your organisation and consider enforcing fine-grained personal access tokens with minimal repository permissions instead of broad OAuth tokens. Ensure developer awareness training covers the risk of clicking unsolicited GitHub.dev links, and review whether your GitHub organisation policies can restrict OAuth app access.

Original advisory: One-Click GitHub Dev Attack Lets Attackers Steal Full GitHub OAuth Tokens

A debug flag accidentally left enabled in production builds of multiple Microsoft 365 Android apps disabled a security check that restricts account token sharing to trusted Microsoft applications. As a result, any app installed on the same Android device could silently request and receive the signed-in user’s authentication token, granting full access to email, files, calendar, and the ability to send messages on their behalf. No user interaction, credentials, or elevated permissions were required to exploit this.

Architect’s Take: Audit your mobile application management (MAM) and Conditional Access policies to ensure app-based controls are enforced at the resource level and are not solely reliant on client-side token handling. Until Microsoft confirms a fully patched build is deployed, consider enforcing Continuous Access Evaluation (CAE) and restricting M365 access on Android to Intune-managed devices with compliant app versions.

Original advisory: Microsoft 365 Android Apps Let Any App Steal Account Tokens via Leftover Debug Flag

A debug flag accidentally left enabled in production builds of multiple Microsoft 365 Android apps disabled the trust check that normally restricts account-token sharing to authorised Microsoft applications. As a result, any app installed on the same Android device could silently request and receive a valid authentication token, granting full access to the victim’s email, files, calendar, and messaging without any user interaction or additional permissions. The flaw affects any user running a vulnerable Microsoft 365 Android app while also having a malicious or compromised app on the same device.

Architect’s Take: Mandate immediate updates to all affected Microsoft 365 Android apps across your managed device estate via your MDM/UEM solution, and review Conditional Access policies to detect anomalous token usage or unexpected app sign-ins. Consider temporarily blocking unmanaged Android devices from accessing Microsoft 365 resources until patched app versions are confirmed deployed.

Original advisory: Microsoft 365 Android Apps Let Any App Steal Account Tokens via Leftover Debug Flag