Rakuten Stock Slides as 101M Member Data Breach Claim Surfaces October 6

Rakuten Group faces two security incidents this week. On October 4, a hacker claimed to be selling data for 101 million Rakuten members on a cybercrime forum for $700, though Rakuten denies any breach occurred. Separately, the company confirmed unauthorized access to its Rakuten Drive cloud storage service on October 6, affecting 15,382 accounts. Meyka rates 4755.T a B with a 12-month forecast of ¥847.69, suggesting limited upside from current levels near ¥667.

Unverified claim of 101 million records for sale

On October 4, a cybercrime forum post titled “SELLING Rakuten Japan 101M” offered what the seller called a “rakuten.co.jp database” for $700. The post included sample data with names, addresses, phone numbers, email addresses, birth dates, member ranks, Rakuten Point balances, and last login times from September and October 2026. Security Measures Lab checked 18 sample records against Rakuten PointClub’s public rank conditions and found no clear contradictions, though the samples lacked passwords or credit card numbers.

Rakuten denies breach; authenticity unconfirmed

Rakuten Group responded that no information leak has been confirmed. The company stated it could not identify the sample accounts when checked against its systems. Security researchers note the seller has posted similar unverified claims before, including 150 million Notion user records in August and 850 million China Mobile records in September, none confirmed by those companies. The data structure in the samples appears simplified compared to typical Rakuten databases.

Confirmed Rakuten Drive breach affects 15,382 accounts

On October 6, Rakuten confirmed unauthorized access to its Rakuten Drive cloud storage service after attackers compromised administrator credentials. The breach exposed stored photos, documents, account names, display names, profile image URLs, encrypted passwords, and password salting strings for 15,382 accounts. Rakuten advised users to avoid reusing passwords, review login history, check order history, and verify registered email and shipping details. The source of the administrator credentials has not been disclosed.

Stock pressure amid security concerns and weak fundamentals

Rakuten stock (4755.T) rose 0.79% to ¥667.30 on October 6, but remains under pressure. Meyka assigns the stock a B grade with a 12-month price target of ¥847.69, suggesting modest upside. The company’s technical indicators show weakness: RSI at 30.58 signals oversold conditions, while the ADX at 25.64 indicates a strong downtrend. Rakuten’s financial metrics remain challenged, with negative earnings per share of -¥30.27 and a debt-to-equity ratio of 5.24x, well above healthy levels.

Final Thoughts

The unverified 101 million record claim remains unconfirmed, but the confirmed Rakuten Drive breach and weak financial fundamentals create near-term headwinds. With Meyka grading 4755.T a B and RSI at 30.58, the stock faces oversold conditions; investors should monitor Rakuten’s official breach investigation and Q3 earnings due November 13.

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