Coordinated and Responsible Vulnerability Disclosure Free Bug Bounty Program 469,274 coordinated disclosures
251,355 fixed vulnerabilities
623 bug bounties with 1247 websites
12,669 researchers, 978 honor badges

Leon | Security Researcher Profile


Security researcher Leon has already helped fix 221 vulnerabilities.



Researcher reputation:  330

Real name:
Aldo Moreno

About me:
Cybersecurity enthusiast.
Bug bounty hunter.

How to contact me:
English or Spanish communication.

[email protected]

Alternative Contacts:
[email protected]

Experience in Application Security
1-3 years

Award / Bug Bounty I prefer:
This is only if you want to reward me.
Paypal, Amazon gift card, BTC, t-shirt, gin, stickers or any kind of swag.

Paypal: [email protected]
BTC: 33x6BpPjBiR7g5UeefGQQuZLW2BVAd3aQV

Halls of Fame:
BBC
Dell
Papercut
PejaDesign
Tu-Chemnitz
Studis-Online
Telefonica Germany

Follow me on:
Twitter

Recommendations and Acknowledgements

    12 September, 2019
     phdev6 ph-dev from Peter Hahn:
Leon found a XSS bug on our site. Thanks a lot!
    23 April, 2019
     itsecop itsecop :
Thanks Geek_Pwn, for pointed out XSS vulnerabilities on our website!
Your input was very much appreciated!
    29 March, 2019
     Downnotify Marijn Otte from DownNotifier.com:
Aldo found a big security issue in our application, using a creative way to exploit it.
    17 February, 2019
     JimM97459222 Jim from GH:
Thank you for pointing out the XSS vulnerability in our site. We appreciate your work and quick response. Thank you!!
    19 December, 2018
     HIGHFLYERS_WA Tom from WADC:
Thanks a lot for making our webserver more secure! Thums up!
    10 July, 2018
     nietofarias Ignacio Nieto from Despegar:
Thanks Aldo for reporting us some XSS vulnerabilities! It was very helpful!
    25 June, 2018
     TucWebmaster Frank Richter from TU Chemnitz:
Geek_Pwn discovered XSS bugs in my site. Thanks for reporting them to us and checking our fixes, your work is appreciated!
    7 June, 2018
     uriblackman Uri from GIDEON:
Thanks Geek_Pwn for finding and alerting us to the XSS bug.
    4 June, 2018
     pejadesign Gabriele from Peja Design:
Geek_Pwn helped me discover an fix an XSS bug. Many Thanks
    2 June, 2018
     digisolid Martin de Vries from Klik-info.nl:
Geek_Pwn found an XSS bug on our website. Thanks!

Shows the first 10 recommendations. See all.

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:349
Total reports on VIP sites:39
Total patched vulnerabilities:221
Total vulnerabilities on Hold (Open Bug Bounty):3
Recommendations received:14
Active since:20.09.2017

Open Bug Bounty Certificate



18.09.2019  SSRF | Reading Local Files from DownNotifier server

Hello guys, this is my first write-up and I would like to share it with the bug bounty community, it’s a SSRF I found some months ago.

DownNotifier is an online tool to monitor a website downtime. This tool sends an alert to registered email and sms when the website is down.

DownNotifier has a BBP on Openbugbounty, so I decided to take a look on https://www.downnotifier.com. When I browsed to the website, I noticed a text field for URL and SSRF vulnerability quickly came to mind.


Reported Vulnerabilities

All Submissions VIP SubmissionsFeatured Submissions

Domain Reported Status Type
17.11.2019
On Hold
Cross Site Scripting
08.11.2019
On Hold
Cross Site Scripting
04.11.2019
On Hold
Cross Site Scripting
08.09.2019
patched
Cross Site Scripting
31.08.2019
patched
Cross Site Scripting
22.08.2019
unpatched
Cross Site Scripting
02.07.2019
patched
Cross Site Scripting
30.06.2019
patched
Cross Site Scripting
02.06.2019
patched
Cross Site Scripting
27.03.2019
patched
Cross Site Scripting
18.03.2019
unpatched
Cross Site Scripting
06.03.2019
patched
Cross Site Scripting
04.03.2019
patched
Cross Site Scripting
04.03.2019
patched
Cross Site Scripting
01.03.2019
patched
Improper Access Control 
27.02.2019
unpatched
Cross Site Scripting
07.02.2019
patched
Cross Site Scripting
02.02.2019
patched
Cross Site Scripting
26.01.2019
unpatched
Cross Site Scripting
26.01.2019
patched
Cross Site Scripting

  Latest Patched

 20.11.2019 netbarg.com
 20.11.2019 honda-tech.com
 20.11.2019 audiworld.com
 20.11.2019 clublexus.com
 20.11.2019 rennlist.com
 20.11.2019 mbworld.org
 20.11.2019 cnbctv18.com
 20.11.2019 climate.hawaii.gov
 20.11.2019 corvetteforum.com
 20.11.2019 adultwork.com

  Latest Blog Posts

30.10.2019 by Nep_1337_1998
Denial of Service vulnerability in script-loader.php (CVE-2018-6389)
17.10.2019 by 0xrocky
Stored XSS
17.10.2019 by geeknik
The "S" in IOT is for Security
16.10.2019 by Fadavvi
Best XSS Vectors
01.10.2019 by Renzi25031469
#Security 100%

  Recent Recommendations

    19 November, 2019
     sbcsirt:
Dear fakessh,

Thank you for discovering the vulnerability of our website.
We were able to immediately fix this vulnerability thanks to your report.
We appreciate your kindness.

Best regards,
SoftBank CSIRT
    17 November, 2019
     Project84823360:
4N_CURZE did a great job locating and letting us know about vulnerabilities. He was detailed, professional and provided exceptional turnaround time. It was our pleasure to work with him! Thanks again.
    15 November, 2019
     hyperext_uk:
@Cyberanteater very kindly alerted us about a git vunerability on one of our websites which we promptly fixed. This also prompted us to audit all our other projects.

Much appreciated.
Steve
    15 November, 2019
     dalitso47152461:
Thanks for bringing the issue to our attention. The info you provided was very helpful and instrumental in getting a fix in place.
    14 November, 2019
     cloudrexx:
Thank you very much for making us aware of the issue and providing us a high quality vulnerability report which helped us identify the source of the vulnerability right away.