benfrog writes: "A just-patched bug in Instragram potentially exposed user's private photographs to strangers. According to a Spanish-languge blog post by security researcher Sebastián Guerrero (English-lanuage security advisory related to his post here), photos and private information were exposed by the bug stemming from the ability to guess and forge approved requests to follow a user. Guerrero illustrated the vulnerability by adding himself to a group of people followed by Facebook founder Mark Zuckerberg."
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