CVE-2026-73315

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.

• CWE-918

• https://bombobombone.github.io/posts/cve-2026-73315/Exploit, Third Party Advisory
• https://github.com/BomboBombone/CVE-2026-73315Exploit, Third Party Advisory
• https://www.vulncheck.com/advisories/xenforo-ssrf-via-paypal-rest-webhook-handlerThird Party Advisory
• https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/Release Notes
• https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/Release Notes

Published

Sep 8, 2026

Last Modified

Sep 11, 2026

Status

Analyzed

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