CVE-2026-73315 — XenForo < 2.3.13 SSRF via PayPal REST Webhook Handler
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 o…
Published: 2026-09-08 · CVSS: 7.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7