The vulnerability was caused by a field of a form that was displayed back to the web interface without escaping the HTML characters. In the following code box I show the affected HTML:
An attacker could attempt to trick users into visiting a malicious URL such as https://www.tuenti.com/?m=Tusimtogo&func=index&siaccod=%22%3E%3Ch2%3E%3Cstrong%3EHELLO%20WORLD so that the arbitrary HTML code of the siaccod parameter would be executed on victim's web browser.
I reported the vulnerability to security@tuenti.com and in a few hours I got the following reply telling me that the bug had been fixed and thanking me.
The fix was as easy as removing the line that displayed back the content of the siaccod field.
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