One Empty Header to Admin: How an Auth Bypass Breaks OpenBullet2

One Empty Header to Admin: How an Auth Bypass Breaks OpenBullet2

From Cybersecurity Tech Brief By HackerNoon by HackerNoon

June 7, 2026 · 9 min

About this episode

The episode discusses five vulnerabilities in OpenBullet2, including an authentication bypass and various security risks.

This story was originally published on HackerNoon at: https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2 . Five vulnerabilities in OpenBullet2: an empty API key, path traversal, RCE, and an NTLM hash leak. Check more stories related to cybersecurity at: https://hackernoon.com/c/cybersecurity . You can also check exclusive content about #ethical-hacking , #rce , #exploit , #openbullet2 , #what-is-openbullet2 , #openbullet2-explained , #vulnerabilities , #cybersecurity-awareness , and more. This story was written by: @vognik . Learn more about this writer by checking @vognik's about page, and for more stories, please visit hackernoon.com . This article walks through 5 CVEs: an empty X-Api-Key header that bypasses authentication by default, arbitrary C# and script-file execution, a wordlist path traversal granting arbitrary file read/write/delete as root, and an NTLMv2 hash leak on Windows.

Topics covered

  • cybersecurity
  • vulnerabilities
  • authentication bypass
  • OpenBullet2
  • ethical hacking

Keywords

  • OpenBullet2
  • auth bypass
  • vulnerabilities
  • RCE
  • NTLM hash leak

Mentioned in this episode

Organizations: HackerNoon

Products: OpenBullet2

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