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CVE-2026-73316

HighPublished

XenForo < 2.3.13 Payment Replay via PayPal REST Payment Provider

Published: Sep 8, 2026
Updated: Sep 10, 2026
Assigning CNA: VulnCheck
Evidence observed: Sep 8, 2026

Primary CVSS

8.7/ 10High

nvd · CVSS 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 10.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-73316PoC
Proof-of-concept and technical write-up for CVE-2026-73316, a PayPal REST webhook replay vulnerability in XenForo before 2.3.13, including reproduction steps and fix details.

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