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This Week In Security: Poking Holes In Two Factor Authentication

ID: 11bad21f-d0d6-5da5-87d8-e88963ee964d

STIX ID: report--11bad21f-d0d6-5da5-87d8-e88963ee964d

Feed Name: Security Ledger

Threat Score
55/100

Date Published: 2014-06-29

Date Updated: 2026-05-08

Author: Paul Roberts

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### Executive Summary DUO Security disclosed a flaw in PayPal's mobile APIs that could allow an attacker with a valid PayPal username and password to bypass two-factor authentication for accounts that had 2FA enabled; PayPal temporarily disabled mobile 2FA while the issue was remediated. The report focuses on the vulnerability discovery and mitigation steps rather than evidence of active abuse.

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