Daniel Tomescu

Senior Manager / Ethical Hacker


<Senior Manager / Ethical Hacker at KPMG Romania> by day <Bug Bounty Hunter / Curious Security Researcher> by night. 

Abusing postMessage API for 6 figures/year

The postMessage API is a very versatile option for achieving secure communication between different browser windows, generally used for bypassing same-origin policy restrictions. It is generally used in complex, functionality-rich web applications and has the potential to streamline complex business flows, but is also very often poorly implemented. This presentation will highlight tens of postMessage vulnerabilities found in the last year, varying from XSS issues to account takeovers. Millions of people potentially affected, cool stories, big bounties, not-very-fixed vulnerabilities. Everything is vulnerable, from web chats to payment flows, from some of our favorite Romanian companies to global giants that power our everyday activities.

Are you the next cyber security superstar?

If you are passionate about an information security topic or you have strong technical skills developing researches on your own, you should definitely Apply at Call for Papers. By submitting you will have the chance to showcase your work to +2000 attendees.

Other speakers joining this year

Cristian Sandescu

CEO CODA Intelligence

Cristian Cornea

Penetration Tester & Security Researcher

Chris Kubecka

CEO Hypasec

Ready for this year's presentations?

By registering you will unlock access to 60+ speakers and two full days with cyber security news & showcases from worldwide leaders.


Sponsors & Partners

They help us make this conference possible.


Orange Romania is part of the Orange Group, one of the largest global telecommunications operators that connects hundreds of millions of customers worldwide. With over 11 million local customers and an annual turnover exceeding 1.5 billion euros, Orange Romania connects 1 in 2 Romanians and offers an extensive range of communication solutions for both individual and corporate customers, from basic connectivity services to complete mobile, fixed internet, TV packages, and complex IT&C solutions through Orange Business

Orange Romania is the number 1 operator in terms of network performance, and also holds nine consecutive Top Employer certifications, which confirm that Orange Romania, in addition to the remarkable products and services it offers, pays special attention to its employees and working environment. In the past 3 years Orange has launched two 5G Labs in Bucharest and Iasi, that aim to support researchers, startups and companies to test their 5G solutions in advance. 

In addition, Orange is a long-term supporter of the startup ecosystem through the Orange Fab accelerator program designed to support entrepreneurs in the development of innovative products and their distribution locally and internationally.

Gold Partners

defcamp 2022 booking holdings

Silver Partners

Bronze Partner