[Leaked Japanese Password List] │ ▼ [Automated Brute-Force Tools] │ ▼ [Target: Japanese E-Commerce / Banking / Gaming Portals]
The updated Japanese password list is a significant improvement for security testing and defense. However, lack of documentation and presence of invalid entries reduce its reliability in automated pipelines. Still highly recommended for Japanese-language environments.
: There is a high prevalence of cultural terms and "base words" in Japanese passwords. : Flower names like (cherry blossom) and (sunflower) are common. : Personal names such as frequently appear in leaked lists. Pop Culture : References to anime and manga, such as , are notably present. Use of Dates
: Incorporating Era names like Heisei or Reiwa alongside year dates (e.g., Reiwa2024 ). Recent Security Trends in Japan (2024-2026)
: Most top passwords can be cracked in under a second. 123456789 took the top spot in Japan for 2025. japanese password list updated
People in Japan use unique words, numbers, and keyboard patterns.
The recent update to the Japanese password list (often used in penetration testing, password auditing, or credential stuffing simulations) shows a compared to previous versions. The list appears to be sourced from real data breaches, public leaks, and common password patterns observed among Japanese-speaking internet users.
Security researchers have proposed methods specifically optimized for Japanese users to bridge the gap between memorability and security.
Diving deeper into the GitHub Japanese wordlists , Kenji noticed "seasonal" security: Fuyu2016 (Winter), Haru2017 (Spring), and Aki12345 (Autumn) were peppered throughout the leak. : There is a high prevalence of cultural
For Japanese users, incorporate elements such as:
For security researchers or those interested in defensive auditing, several updated repositories provide Japanese-specific wordlists: Weakpass [Japanese.dic]:
In 2026, cybersecurity experts and recent data breaches have highlighted that while global favorites like "123456" still lead in Japan, unique local trends such as the use of flower names and keyboard patterns continue to expose users to risk . Japan's Most Common Passwords (2025–2026)
キーボードのキーを順番になぞるパターン（通称：キーボードウォーク）は、世界共通の脆弱なパスワードですが、日本には「JIS配列（日本語キーボード）」特有のパターンが存在します。 qwertyuiop （英数配列の最上段） asdfghjkl （英数配列の中段） Pop Culture : References to anime and manga,
The risk of using predictable or reused passwords isn't theoretical. It has directly led to a series of high-profile data breaches in Japan, resulting in the exposure of millions of users' personal information. These incidents often begin with "list-based attacks" (also known as credential stuffing), where attackers use leaked username-password combinations to break into unrelated services.
: "QWERTY" and its Japanese keyboard equivalents (such as "asdfghjkl") are frequently observed. 3. Localized Linguistic Vulnerabilities
Allow users to input their preferences for password generation, such as:
: "Sakura" (cherry blossom), "Himawari" (sunflower), and " Doraemon " (manga character) frequently appear in the top 50 .
