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741,842 coordinated disclosures
436,455 fixed vulnerabilities
1144 bug bounties with 2,195 websites
20,608 researchers, 1255 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

 19.01.2021 gs1.org
 19.01.2021 embedsocial.com
 19.01.2021 gamasutra.com
 19.01.2021 b92.net
 17.01.2021 ndtv.com
 17.01.2021 splunk.com
 17.01.2021 tidal.com
 16.01.2021 liveinternet.ru
 16.01.2021 kickit.to
 16.01.2021 sante.fr

  Latest Blog Posts

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
26.10.2020 by _r00t1ng_
Bypass Addslashes using Multibyte Character
26.10.2020 by _r00t1ng_
One Payload to Inject them all - MultiQuery Injection

  Recent Recommendations

@rantoniazzi     19 January, 2021
    Twitter rantoniazzi:
Thanks for pointing out a public phpinfo(). Very fast contact.
@driesvanhaver     19 January, 2021
    Twitter driesvanhaver:
We were informed of a vulnerability. Thank you to Praveen for telling us it existed.
@snowdarkz     19 January, 2021
    Twitter snowdarkz:
Thank you very much for the help with the vulnerability. Very fast contact.
@Cazz0r     19 January, 2021
    Twitter Cazz0r:
Massive thanks for Warbid for his vulnerability report sent directly to us! Thanks for making the web a safer place!
@CahEmiliano     18 January, 2021
    Twitter CahEmiliano:
Pramod is an excelent professional. He answer very quickly and help us to fix a security issue.
I recommend his skills and knowledge, he is a great cybersecurity expert.