High severity8.6NVD Advisory· Published Sep 8, 2026· Updated Sep 11, 2026
CVE-2026-73315
CVE-2026-73315
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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Affected products
2Patches
Vulnerability mechanics
References
4- bombobombone.github.io/posts/cve-2026-73315/nvdExploitThird Party Advisory
- www.vulncheck.com/advisories/xenforo-ssrf-via-paypal-rest-webhook-handlernvdThird Party Advisory
- xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/nvdRelease Notes
- xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/nvdRelease Notes
News mentions
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