MyBB ≥ v1.2+ Hash

What is MyBB ≥ v1.2+?

The MyBB password hashing scheme introduced in version ≥1.2+ is a hybrid cryptographic format derived from the **SHA-1** hashing algorithm, augmented with a **customized iteration count** and a **non-standardized salt application** to mitigate rainbow table attacks. Structurally, it follows a two-step process: first, the input password is concatenated with a **fixed-length salt** (typically a 16-byte hexadecimal string) and hashed using SHA-1, then the resulting hash is iterated a specified number of times (default: **1000 iterations**) via SHA-1 again. The final output is a 40-character hexadecimal string, prefixed with a version identifier (e.g., `$mybb$1$`) to distinguish it from other formats. This scheme was designed to enhance security over plain SHA-1 by increasing computational overhead, though its reliance on SHA-1’s legacy collision resistance and lack of formal cryptographic scrutiny rendered it vulnerable from inception. The primary use-case was password storage in MyBB forum software, where simplicity and compatibility with legacy systems took precedence over modern cryptographic best practices.

The MyBB ≥v1.2+ hashing scheme is susceptible to cracking due to its **inherent cryptographic weaknesses, suboptimal iteration handling, and lack of salting discipline**. SHA-1’s **collision vulnerability** (demonstrated via pre-image attacks) allows adversaries to reverse-engineer passwords with sufficient computational resources, particularly when combined with **GPU-accelerated brute-force tools** like Hashcat or John the Ripper. The iteration count, while intended to slow attacks, is **static and insufficient**—modern hardware can evaluate billions of hashes per second, rendering 1000 iterations negligible. Additionally, the **salt is not cryptographically secure** (often derived from predictable sources or reused), enabling **rainbow table precomputation** for common passwords. Finally, the absence of **key stretching** (e.g., PBKDF2, bcrypt, or Argon2) means the scheme fails to adapt to hardware advancements, leaving it vulnerable to **optimized parallel cracking** and **side-channel attacks** when deployed in high-throughput environments.

Identifying MyBB ≥ v1.2+ 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 MyBB ≥ v1.2+, security researchers analyze the hash against a strict regular expression (regex) signature (shown above) to find structural matches.

How to Crack MyBB ≥ v1.2+

If you need to recover the plaintext password for a MyBB ≥ v1.2+ 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.