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CVE-2026-73315

8.6 · HIGH

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 request…

Published Sep 8, 2026xenforoCWE-918EPSS 0.36%

Overview

CVE-2026-73315 is a high-severity vulnerability affecting xenforo xenforo. It was published on September 8, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from xenforo. Update xenforo to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
xenforoxenforo>= 0, < 2.3.13Affected

References

Refbombobombone.github.io/posts/cve-2026-73315/GitHubgithub.com/BomboBombone/CVE-2026-73315Refwww.vulncheck.com/advisories/xenforo-ssrf-via-paypal-rest-webhook-handlerRefxenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/Refxenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/

How CyberStrike helps

Frequently asked questions

What is CVE-2026-73315?

CVE-2026-73315 is a high-severity vulnerability affecting xenforo xenforo. It was published on September 8, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-73315?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-73315?

Check the references section for vendor advisories and patches from xenforo. Update xenforo to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-73315?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-73315 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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