Wordpress ≥ v2.6.2 Hash

What is Wordpress ≥ v2.6.2?

The cryptographic hash format introduced in WordPress from version 2.6.2 onward represents an evolution of the original MD5-based password hashing scheme, transitioning to a more secure, though still flawed, approach known as "WordPress Secure Hash" (or "wp_salted_password_hash"). This format incorporates a **salted MD5-based iteration** designed to mitigate some of the worst vulnerabilities of plain MD5 hashing. The structure begins with a **fixed-length salt prefix** (typically a 22-character string derived from the user’s email or a static value in older implementations), followed by the user’s password, and concludes with a **double-hashed MD5** (MD5(MD5(password + salt))). The resulting 32-character hexadecimal hash is stored in the database alongside the salt, enabling verification during authentication. While this design aimed to slow brute-force attacks by obfuscating plaintext passwords and introducing computational overhead, it remains fundamentally insecure due to its reliance on MD5—a cryptographically broken hash function vulnerable to collision attacks and precomputation.

The primary vulnerabilities of this format stem from its reliance on **MD5’s inherent weaknesses**, combined with suboptimal implementation choices. The absence of a **per-password salt** (instead using a shared or email-derived salt) allows attackers to precompute rainbow tables targeting common salt values, drastically reducing cracking time. Additionally, MD5’s **collision resistance is insufficient**—modern GPU/ASIC clusters (e.g., using tools like Hashcat or John the Ripper with optimized kernels) can brute-force salted MD5 hashes at **tens of millions of attempts per second**, rendering the iteration scheme ineffective. The lack of **key stretching** (e.g., bcrypt, Argon2, or PBKDF2) means the hashing process remains computationally trivial, and the **fixed-length output** enables efficient precomputation of password-salt combinations. Finally, the format’s reliance on MD5’s **avalanche property failures** allows adversaries to exploit weak password patterns or dictionary attacks with near-deterministic success, making it unsuitable for modern security standards.

Identifying Wordpress ≥ v2.6.2 Hashes

Identifying a hash blindly is often difficult because multiple algorithms can output strings of the exact same length. For example, a standard 32-character hexadecimal string could be MD5, NTLM, MD4, or LM. To definitively identify Wordpress ≥ v2.6.2, security researchers analyze the hash against a strict regular expression (regex) signature (shown above) to find structural matches.

How to Crack Wordpress ≥ v2.6.2

If you need to recover the plaintext password for a Wordpress ≥ v2.6.2 hash during a penetration test or forensics investigation, you must supply the correct module ID to your cracking software. Use the exact commands provided at the top of this page to target the hash successfully.