High 7.5Published Sep 8, 2026

CVE-2026-73316XenForo < 2.3.13 Payment Replay via PayPal REST Payment Provider

Updated under an hour ago (2026-10-19 07:30 UTC)

Does this affect you?

It affects XenForo. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for XenForo

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-345
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Oct 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

XenForo XenForo xenforo:xenforo (from the name)	before 2.3.13	CNA record
xenforo xenforo xenforo:xenforo	before 2.3.13	NVD

References

https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/vendor-advisory, patch, release-notes
https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/release-notes
https://bombobombone.github.io/posts/cve-2026-73316/technical-description, exploit, third-party-advisory
https://github.com/BomboBombone/CVE-2026-73316exploit, third-party-advisory
https://www.vulncheck.com/advisories/xenforo-payment-replay-via-paypal-rest-payment-providerthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.