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CVE-2026-73315 Details

Description

XenForo before 2.3.13 contains a server-side request forgery vulnerability in the PayPal REST webhook handler that allows unauthenticated attackers to cause the server to make outbound HTTP requests to arbitrary destinations by supplying a crafted certificate URL in webhook headers without scheme, hostname, or allowlist validation. Attackers can submit a crafted POST to the PayPal webhook callback endpoint to reach internal network resources including cloud instance metadata services, potentially disclosing IAM credentials or enabling secondary internal service exploitation.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:8.6 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://bombobombone.github.io/posts/cve-2026-73315/	[email protected]	ExploitThird Party Advisory
https://github.com/BomboBombone/CVE-2026-73315	[email protected]	ExploitThird Party Advisory
https://www.vulncheck.com/advisories/xenforo-ssrf-via-paypal-rest-webhook-handler	[email protected]	Third Party Advisory
https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/	[email protected]	Release Notes
https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/	[email protected]	Release Notes

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-918	Server-Side Request Forgery (SSRF)	[email protected]

Affected Products

Product	Versions
xenforo xenforo	< 2.3.13
CPE cpe:2.3:a:xenforo:xenforo:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Sep 11, 2026	Initial Analysis	[email protected]
Sep 9, 2026	CVE Modified	[email protected]
Sep 8, 2026	New CVE Received	[email protected]
Sep 8, 2026	CVE Modified	CISA-ADP