Microsoft OneDrive File Picker Vulnerability Allows Full Access to Cloud Storage When Uploading a Single File
May 28, 2025
Data Privacy / Vulnerability
Cybersecurity researchers have identified a serious security flaw in Microsoft’s OneDrive File Picker. If exploited, this vulnerability could enable websites to gain access to a user’s entire cloud storage, rather than just the files intended for upload. According to the Oasis Research Team’s report to The Hacker News, the issue arises from overly broad OAuth scopes and unclear consent screens that do not adequately communicate the level of access being granted. This flaw poses significant risks, including potential customer data leaks and violations of compliance regulations. Affected applications may include ChatGPT, Slack, Trello, and ClickUp, all of which integrate with Microsoft’s cloud service. The core of the problem lies in the excessive permissions required by the OneDrive File Picker, which requests read access to the entire drive, even when only a single file is selected for upload, due to a lack of fine-grained permission controls.
Data Privacy / Vulnerability
Security Flaw in Microsoft OneDrive File Picker Exposes Users to Potential Data Breaches May 28, 2025 Recent findings from cybersecurity researchers at the Oasis Research Team have unveiled a serious vulnerability within Microsoft’s OneDrive File Picker. This flaw enables websites to gain unrestricted access to users’ entire cloud storage, even…
Microsoft OneDrive File Picker Vulnerability Allows Full Access to Cloud Storage When Uploading a Single File
May 28, 2025
Data Privacy / Vulnerability
Cybersecurity researchers have identified a serious security flaw in Microsoft’s OneDrive File Picker. If exploited, this vulnerability could enable websites to gain access to a user’s entire cloud storage, rather than just the files intended for upload. According to the Oasis Research Team’s report to The Hacker News, the issue arises from overly broad OAuth scopes and unclear consent screens that do not adequately communicate the level of access being granted. This flaw poses significant risks, including potential customer data leaks and violations of compliance regulations. Affected applications may include ChatGPT, Slack, Trello, and ClickUp, all of which integrate with Microsoft’s cloud service. The core of the problem lies in the excessive permissions required by the OneDrive File Picker, which requests read access to the entire drive, even when only a single file is selected for upload, due to a lack of fine-grained permission controls.