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Nextcloud: Remote attacker can impersonate Social users via ActivityPub API

🗓️ 12 Dec 2018 15:31:47Reported by tomkType 
hackerone
 hackerone
🔗 hackerone.com👁 36 Views

Remote attacker can impersonate Social users via ActivityPub API. Security concern found in the Signature header checks allows an unauthenticated attacker to masquerade as users, posting messages on their behalf with potential visibility to followers

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