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827,779 coordinated disclosures
466,687 fixed vulnerabilities
1275 bug bounties with 2,433 websites
21,684 researchers, 1280 honor badges

Tech4 | Security Researcher Profile


Security researcher Tech4 has already helped fix 64 vulnerabilities.



Researcher reputation:  40

Real name:
Yuji Hayamizu

About me:
SOC Analyst from Japan

How to contact me:
tech{AT}4{DOT}zaq{DOT}jp

All communications will be kept private.

Award / Bug Bounty I prefer:
A thanks/profile recommendation is enough, but if you feel like treating me to something extra I appreciate the following -

Bug Bounty
Vouchers (eg. Amazon)
Gadgets
Swag
Hall of Fame

Follow me on:
Twitter

Recommendations and Acknowledgements

@h_ono     3 August, 2020
    Twitter h_ono h_ono from DBCLS:
Great work, thanks for finding a bug and kindly reporting it.
@juunkwan     17 February, 2020
    Twitter juunkwan Jun Takashima from AID-DCC:
Thank you for your polite response.
It was very helpful.

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:148
Total reports on VIP sites:7
Total patched vulnerabilities:64
Total vulnerabilities on Hold (Open Bug Bounty):1
Recommendations received:2
Active since:02.02.2020

Open Bug Bounty Certificate


Researcher Certificate



No posts in blog yet


Reported Vulnerabilities

All Submissions VIP Submissions

  Latest Patched

 04.03.2021 jobth.com
 04.03.2021 tcyonline.com
 03.03.2021 klear.com
 03.03.2021 haraj.ws
 03.03.2021 mylibmusic.me
 03.03.2021 statscrop.com
 02.03.2021 deltadentalins.com
 02.03.2021 uscutter.com
 02.03.2021 skoob.com.br
 02.03.2021 unimed.coop.br

  Latest Blog Posts

10.02.2021 by Renzi25031469
Sysadminotaur nº88
10.02.2021 by Open Bug Bounty
Higher Submissions Quality Standard
25.12.2020 by _Y000_
How to bypass mod_security (WAF)
10.12.2020 by _Y000_
sql injection to bypass Mod_Security
10.12.2020 by _Y000_
Create encoded sql payloads

  Recent Recommendations

@_lhordd     3 March, 2021
    Twitter _lhordd:
Thanks for helping me with the flaws in my site. The best work i’ve ever seen.
@_Kkommi     3 March, 2021
    Twitter _Kkommi:
Thanks for reporting xss in my site.
@_Kkommi     3 March, 2021
    Twitter _Kkommi:
Thanks
@CERT_rlp     1 March, 2021
    Twitter CERT_rlp:
The team of CERT-rlp would like to thank Cyber_India for a responsible and coordinated disclosure of vulnerabilities.
@CERT_rlp     1 March, 2021
    Twitter CERT_rlp:
The team of CERT-rlp would like to thank Cyber_India for a responsible and coordinated disclosure of vulnerabilities