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CVE-2026-73316

XenForo < 2.3.13 Payment Replay via PayPal REST Payment Provider

HIGH
7.5
CVSS Score
Published: September 8, 2026 at 01:18 PM UTC
Updated: October 1, 2026 at 03:20 PM UTC
1 product affected across 1 vendorXenForo

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Severity
HIGH7.5
Exploit prediction
EPSS 0.3%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

XenForo· Xenforo
95%
v < 2.3.13
Affected range stops below 2.3.13, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

Vendor AdvisoryPatchRelease Notes
Source: cverecord
https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/
Release Notes
Source: cverecord
https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/xenforo-payment-replay-via-paypal-rest-payment-provider
Technical DescriptionExploitThird Party Advisory
Source: [email protected]
https://bombobombone.github.io/posts/cve-2026-73316/
ExploitThird Party Advisory
Source: [email protected]
https://github.com/BomboBombone/CVE-2026-73316

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHVulnCheck
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-345

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