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333,994 fixed vulnerabilities
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15,962 researchers, 1101 honor badges

Tech4 | Security Researcher Profile


Security researcher Tech4 has already helped fix 17 vulnerabilities.



Researcher reputation:  20

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 -

Vouchers (eg. Amazon)
Gadgets
Swag
Hall of Fame

Follow me on:
Twitter

Recommendations and Acknowledgements

    17 February, 2020
     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+ Websites
50+ Websites
500+ Websites
WEB SECURITY VETERAN
1000+ Websites

Advanced Security Research

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

Outstanding Achievements

Secured OBB
OBB Advocate
Improved OBB

Commitment to Remediate and Patch

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

Recommendations and Recognition

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

Distinguished Blog Author

1 Post
3 Posts
5+ Posts

Research Statistics



Total reports:99
Total reports on VIP sites:5
Total patched vulnerabilities:17
Total vulnerabilities on Hold (Open Bug Bounty):74
Recommendations received:1
Active since:02.02.2020



No posts in blog yet


Reported Vulnerabilities

All Submissions VIP Submissions

Domain Reported Status Type
30.05.2020
On Hold
Cross Site Scripting
30.05.2020
On Hold
Cross Site Scripting
29.05.2020
On Hold
Cross Site Scripting
27.05.2020
On Hold
Cross Site Scripting
27.05.2020
On Hold
Cross Site Scripting
22.05.2020
On Hold
Cross Site Scripting
22.05.2020
On Hold
Cross Site Scripting
22.05.2020
On Hold
Cross Site Scripting
22.05.2020
On Hold
Cross Site Scripting
22.05.2020
On Hold
Cross Site Scripting
22.05.2020
On Hold
Cross Site Scripting
05.05.2020
On Hold
Open Redirect
05.05.2020
On Hold
Open Redirect
05.05.2020
On Hold
Cross Site Scripting
05.05.2020
On Hold
Cross Site Scripting
05.05.2020
On Hold
Open Redirect
05.05.2020
On Hold
Cross Site Scripting
05.05.2020
On Hold
Cross Site Scripting
05.05.2020
On Hold
Cross Site Scripting
05.05.2020
On Hold
Open Redirect

  Latest Patched

 30.05.2020 uky.edu
 30.05.2020 tabletki.ua
 30.05.2020 earthquake.usgs.gov
 30.05.2020 cancer.net
 30.05.2020 wikitree.co.kr
 30.05.2020 zaubacorp.com
 28.05.2020 aff.to
 27.05.2020 gamebanana.com
 26.05.2020 arise.com
 26.05.2020 hyundai.com

  Latest Blog Posts

04.04.2020 by Rando02355205
(Alibaba) message.alibaba.com [IDOR] - [Bug Bounty]
12.03.2020 by Rando02355205
(Paypal) www.paypal.com [CSP High Level] - [XSS Reflected] - [Bug Bounty] - [Write Up]
08.03.2020 by CybeReports
JDECO.net XSS Vulnerability| CybeReports
29.02.2020 by Rando02355205
(Google) groups.google.com - [Stored XSS] - [Bug Bounty] - [WriteUp] - [24/02/2020]
10.02.2020 by 0xrocky
Stored XSS on h2biz.net

  Recent Recommendations

    28 May, 2020
     georgekgk:
Thank you Daniel for helping us to find and fix that security issue!
    28 May, 2020
     PaulKLeasure1:
Thank you ChaitanyaM43! I appreciate you discovering the XXS vulnerability. You responded quickly with the information needed for me to address the issue.
    26 May, 2020
     viewbug:
Thank you Guarav! Very professional on checking our site for bugs and for providing the details in such a professional manner. We appreciate your help making our platform more secure
    26 May, 2020
     redicius:
Tested my site a lot (according to log :) and found an hidden XSS issue in our site.
Thank you!
    26 May, 2020
     chrisjimallen:
Very helpful insights, spotted something I'd overlooked.