CVE-2026-73316 — XenForo < 2.3.13 Payment Replay via PayPal REST Payment Provider
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 exp…
Published: 2026-09-08 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7