A security researcher has published details of a vulnerability in a popular cloud storage drive after the company failed to issue security patches for over a year.
Remco Vermeulen found a privilege escalation bug in Western Digital’s My Cloud devices, which he said allows an attacker to bypass the admin password on the drive, gaining “complete control” over the user’s data.
The exploit works because drive’s web-based dashboard doesn’t properly check a user’s credentials before giving a possible attacker access to tools that should require higher levels of access.
The bug was “easy” to exploit, Vermeulen told TechCrunch in an email, and was remotely exploitable if a My Cloud device allows remote access over the internet — which thousands of devices do. He posted a proof-of-concept video on Twitter.
Details of the bug were also independently found by another security team, which released its own exploit code.
Vermeulen reported the bug over a year ago, in April 2017, but said the company stopped responding. Normally, security researchers give 90 days for a company to respond, in line with industry-accepted responsible disclosure guidelines.
After he found that WD updated the My Cloud firmware in the meanwhile without fixing the vulnerability he found, he decided to post his findings.
Disrupt 2026: The tech ecosystem, all in one room
Your next round. Your next hire. Your next breakout opportunity. Find it at TechCrunch Disrupt 2026, where 10,000+ founders, investors, and tech leaders gather for three days of 250+ tactical sessions, powerful introductions, and market-defining innovation. Register now to save up to $400.
Save up to $300 or 30% to TechCrunch Founder Summit
1,000+ founders and investors come together at TechCrunch Founder Summit 2026 for a full day focused on growth, execution, and real-world scaling. Learn from founders and investors who have shaped the industry. Connect with peers navigating similar growth stages. Walk away with tactics you can apply immediately
Offer ends March 13.
A year later, WD still hasn’t released a patch.
The company confirmed that it knows of the vulnerability but did not say why it took more than a year to issue a fix. “We are in the process of finalizing a scheduled firmware update that will resolve the reported issue,” a spokesperson said, which will arrive “within a few weeks.”
WD said that several of its My Cloud products are vulnerable — including the EX2, EX4 and Mirror, but not My Cloud Home.
In the meantime, Vermeulen said that there’s no fix and that users have to “just disconnect” the drive altogether if they want to keep their data safe.
