WhatsApp, Telegram Patch Account Hijacking Vulnerability
A vulnerability found in the web versions of WhatsApp and Telegram could have been exploited to hijack accounts by sending the targeted user a malicious HTML file disguised as an image or a video.
The flaw was discovered by researchers at Check Point earlier this month and it was quickly patched by both Telegram and WhatsApp on the server side.
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Story added 15. March 2017, content source with full text you can find at link above.