Impact & Downstream Threats
This breach carries high risk due to the nature of exposed data fields and the scale of affected records.
- Credential stuffing against reused passwords across other platforms
- Targeted phishing campaigns using exposed email addresses
Breach Intelligence
Executive Summary
In December 2016, the forum for the Microsoft Excel tips and solutions site Mr Excel suffered a data breach. The hack of the vBulletin forum led to the exposure of over 366k accounts along with email and IP addresses, dates of birth and salted passwords hashed with MD5. The owner of the MrExcel forum subsequently self-submitted the data to HIBP.
About MrExcel
Online forum and resource site for Microsoft Excel users.
Data Points Exposed
Dark Web Verification
Status: Confirmed
- Dataset containing approximately 366K records identified in breach intelligence sources.
- The data is indexed and searchable across breach notification platforms.
Recommended Actions
⚠️ Do not assume this is low sensitivity.
Non-clients may request a breach impact review.
Frequently Asked Questions
In December 2016, MrExcel experienced a data breach that exposed approximately 366K records containing personal information.
The exposed data includes fields such as activity history:website activity, date of birth, email address, ip address, password.
Approximately 366K records were affected based on current breach intelligence.
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- A public-facing individual
- A high-profile executive
- A customer of MrExcel
- Or concerned about credential reuse
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