Bug bounty platform provider HackerOne Tuesday disclosed that one of its own security analysts mistakenly sent a session cookie to a white-hat researcher on Nov. 24, allowing the researcher to take over the analyst’s account and access vulnerability reports on a number of companies.

The researcher, known in the HackerOne community as haxta4ok00, promptly reported the error to the company and received his (or her) own bug bounty reward of $20,000 for doing so – but not before being questioned about viewing sensitive data belonging to HackerOne clients.

According to HackerOne’s online disclosure, the inadvertent cookie leak took place when the security analyst sent haxta4ok00 a communication containing part of a cURL command – copied from a browser console –  that disclosed the session cookie. The white-hat researcher found that he was able to use the cookie to enter the session, despite working on a different device than the one that started the session. HackerOne said did not prevent the cookie from being used in a separate context because, among other reasons, “many of HackerOne’s users work from mobile connections and through proxies,” and so “blocking access would degrade the user experience for those users.”

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