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Advisories

XenForo < 2.3.13 Payment Replay via PayPal REST Payment Provider

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severity
high
date
Affecting

  • XenForo < 2.3.13

CWE
  • CWE-345 Insufficient Verification of Data Authenticity
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
Marco Paciaroni (BomboBombone)
Description
XenForo before 2.3.13 contains a payment replay vulnerability in the PayPal REST payment provider that allows attackers to process the same webhook payload multiple times by exploiting a missing duplicate transaction ID check. Attackers can replay a valid webhook payload to trigger duplicate payment events, resulting in repeated subscription activations and unauthorized account upgrades.

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