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Open Bug Bounty mentioned in the
Top 6 Bug Bounty programs of
2022 by the InfoSec Institute

The Hacker News

Open Bug Bounty named among the
Top 5 Bug Bounty programs of 2021
by The Hacker News

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1,423,854 coordinated disclosures
1,021,356 fixed vulnerabilities
1,699 bug bounty programs, 3,333 websites
32,137 researchers, 1,491 honor badges

reinforchu | Security Researcher Profile


Security researcher reinforchu has already helped fix 11 vulnerabilities.



Researcher reputation:  30

Real name:
Tsubasa FUJII

About me:
Web security researcher(Japanese)
Home server rack user

Blog: https://www.hack.vet/
About: https://reinforc.hu/
Contact: https://www.iptables.jp/

Contact email:
[email protected][PGP] F755 EA05 F5E4 1F65 BA48 7CE0 3AFD C323 1532 9299

Alternative Contacts:
[email protected]

Certifications & Diplomas:
Diploma in Information Technology: kcg.edu
IPA, Japan: IP, SG, FE
Microsoft: AZ-900

Experience in Application Security
over 5 years

Award / Bug Bounty I prefer:
A small amount is fine, so please donate.
You may include my name in the acknowledgments.
PayPal: https://paypal.me/283F

Halls of Fame:
CVE-2019-8670, CVE-2021-36215
Bug bounty of Microsoft Azure (March 2020) - App Service important vulnerability
APPLE-SA-2020-11-13(WebKit Security-bug fix)
Bug bounty of Google Chrome VRP

Follow me on:
Twitter
Facebook
LinkedIn

Ethics and Rules:
Tsubasa FUJII is required to abide by the ethics and rules of the Open Bug Bounty project. If you reasonably believe that rules are not respected, please report this to us.

Recommendations and Acknowledgements

@MitsuhashiN     5 January, 2021
    Twitter MitsuhashiN Takeo Arai from JST:
Thank you for reporting our website vulnerability.
For your useful informations, we could fix them.
@kushidat     18 January, 2021
    Twitter kushidat Tatsuya Kushida from RIKEN BRC:
Thank you so much for suggesting the vulnerability. The prompt and detailed response helped solve the issues.

Please login via Twitter to add a recommendation

Honor Badges


Number of Secured Websites

10+ Secured Websites Badge
50+ Secured Websites Badge
500+ Secured Websites Badge
Web Security Veteran Badge
10+ Websites
50+ Websites
500+ Websites
WEB SECURITY VETERAN
1000+ Websites

Advanced Security Research

WAF Bypasser Badge
CSRF Master Badge
AppSec Logic Master Badge
Fastest Fix Badge
WAF Bypasser
CSRF Master
30+ Reports
AppSec Logic Master
30+ Reports
Fastest Fix
Fix in 24 hours

Outstanding Achievements

Secured OBB Badge
OBB Advocate Badge
Improved OBB Badge
Secured OBB
OBB Advocate
Improved OBB

Commitment to Remediate and Patch

Patch Master Badge
Patch Guru Badge
Patch Lord Badge
Patch Master
55% Patched
Patch Guru
65% Patched
Patch Lord
75% Patched

Recommendations and Recognition

REPUTABLE Badge
FAMOUS Badge
GLOBALLY TRUSTED Badge
REPUTABLE
10+ Recommends
FAMOUS
25+ Recommends
GLOBALLY TRUSTED
50+ Recommends

Distinguished Blog Author

Distinguished Blog Author Badge
Distinguished Blog Author Badge
Distinguished Blog Author Badge
1 Post
3 Posts
5+ Posts

Research Statistics



Total reports:23
Total patched vulnerabilities:11
Total vulnerabilities on Hold (Open Bug Bounty):1
Recommendations received:2
Active since:25.12.2020

Reported Vulnerabilities

All Submissions




No posts in blog yet










  Latest Patched

 07.12.2022 elearning.ncba.edu.ph
 07.12.2022 av-tacna.staana.edu.pe
 06.12.2022 mof.gov.cy
 06.12.2022 gad.bulacan.gov.ph
 06.12.2022 richlandcountyoh.gov
 06.12.2022 spyur.am
 05.12.2022 t.im
 05.12.2022 mediacongo.net
 05.12.2022 sitejabber.com

  Latest Blog Posts

08.07.2022 by 4websecurity
CVE 2022-29455 is still affecting millions of Wordpress sites
08.07.2022 by kh4sh3i_
Zabbix - SAML SSO Authentication Bypass
08.07.2022 by FR13ND0x7F
The Time Machine — Weaponizing WaybackUrls for Recon, BugBounties , OSINT, Sensitive Endpoints and what not
15.02.2022 by sepkatpro
Ultimate XSS Polyglot
11.11.2021 by mistry4592
The Most used Chrome Extensions are Used For Penetration Testing.

  Recent Recommendations

@seminardd     5 December, 2022
    Twitter seminardd:
Thank you for your valuable report.
@FoenBox     5 December, 2022
    Twitter FoenBox:
Thanks for the heads-up about the misconfiguration! You reported it professionally and discreetly. :)
@rensi_arteaga     25 November, 2022
    Twitter rensi_arteaga:
Gracias por encontrar el bug y reportarlo
@mailslate     21 November, 2022
    Twitter mailslate:
Krystian alerted me to an OWASP high risk vulnerability on my small non-profit website, which I was then able to quickly remedy. Very grateful for this!
@routhinator     14 November, 2022
    Twitter routhinator:
Thank you for your responsible disclosure of several XSS attacks against The Den. This signalled that I had missed an update to the CMS and once patched they were resolved.