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Advisories

XenForo < 2.3.13 SSRF via PayPal REST Webhook Handler

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severity
high
date
Affecting

  • XenForo < 2.3.13

CWE
  • CWE-918 Server-Side Request Forgery (SSRF)
CVSS
7.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N
Credit
Marco Paciaroni (BomboBombone)
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.

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