Security Experts: Flaw Exposes Volunteer Email Addresses, a non-profit organization that helps students learn computer science, informed users over the weekend that a flaw on its website allowed unauthorized parties to access the email addresses of its volunteers.

The organization learned of the vulnerability on Friday night after at least ten of its volunteers received unwanted job offers from a Singapore-based recruiting firm that had leveraged the “error” to obtain private email addresses.

After being contacted by for an explanation, the recruiting company appologized and promised to delete the collected email addresses and stop sending messages to the addresses it obtained by exploiting the bug.

“Based on [the recruiting firm’s] response, it’s possible the vulnerability may have had limited impact, but we can’t be sure,” Hadi Partovi, CEO of, wrote in a blog post. “Regardless, we’ve also inspected and secured the rest of our site from similar vulnerabilities.”

The vulnerability was quickly patched and Partovi pointed out that this was not a data breach, rather a mistake on their part that left volunteer email addresses “accessible via the web browser.”

The CEO said none of its servers were vulnerable, and the details of its 10 million teachers and students were not exposed at any time. Partovi also noted that the organization does not store the email addresses of students aged under 13.

In an email sent to affected individuals, said the incident was caused by a client-side vulnerability in its volunteer map. The email also revealed that location data was also exposed if it was provided to

Related: Verizon Fixes Vulnerability Exposing User Email Accounts

Related: Leaky Databases Expose 25 Million Accounts

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Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.