OneDrive File Picker Flaw Gives Apps Full Access to User Drives · Millions At Risk
Source Reddit InfoSec News
Germany
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United Kingdom
Netherlands
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Description
OneDrive File Picker Flaw Gives Apps Full Access to User Drives - Millions At Risk
Impact
For European organizations, this vulnerability poses a considerable risk to data confidentiality and integrity. Many enterprises and public sector entities in Europe use Microsoft OneDrive as part of Microsoft 365 services for storing sensitive documents, intellectual property, and personal data protected under GDPR. Unauthorized full access by third-party apps could lead to data breaches, loss of sensitive information, and potential compliance violations with strict European data protection regulations. The threat could also disrupt business operations if critical files are altered or deleted. Moreover, the reputational damage and potential regulatory fines resulting from such breaches could be severe. Given the integration of OneDrive in many workflows, the attack surface is broad, affecting not only individual users but also organizational accounts. The absence of known exploits in the wild provides a window for mitigation, but the risk remains high if attackers develop methods to exploit this flaw.
Defensive guidance
European organizations should immediately audit all third-party applications that integrate with OneDrive via the File Picker API, restricting permissions to only trusted and necessary apps. Implement strict application whitelisting and review OAuth consent grants regularly to ensure no excessive permissions are granted. Employ conditional access policies and multi-factor authentication to reduce the risk of compromised credentials being used to authorize malicious apps. Monitor OneDrive access logs for unusual activity, such as unexpected file access patterns or mass downloads. Organizations should also stay alert for official patches or advisories from Microsoft and apply updates promptly once available. In the interim, consider limiting the use of the OneDrive File Picker in high-risk environments or sensitive accounts until the vulnerability is fully addressed. User education on the risks of granting broad permissions to apps is also critical to reduce inadvertent exposure.
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