HIGH 8.7 NVD
CVE-2026-73316
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 mult
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.
Affected Products
- xenforo/xenforo
References
- https://bombobombone.github.io/posts/cve-2026-73316/
- https://github.com/BomboBombone/CVE-2026-73316
- https://www.vulncheck.com/advisories/xenforo-payment-replay-via-paypal-rest-payment-provid
- https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-ga
- https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-securit
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-09-08 via NVD. Affected: xenforo/xenforo.
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