Redpacketsecurity Multiple High-Risk Vulnerabilities Discovered in XenForo Payment Integration
Article Content
- •Three critical vulnerabilities in XenForo's PayPal integration were disclosed.
- •CVE-2026-73314 allows bypassing payment signature validation.
- •CVE-2026-73315 enables server-side request forgery to internal services.
XenForo versions prior to 2.3.13 are affected by three critical vulnerabilities: CVE-2026-73314, CVE-2026-73315, and CVE-2026-73316. CVE-2026-73314 allows unauthenticated attackers to bypass PayPal payment signature validation, risking fraudulent transactions. CVE-2026-73315 enables server-side request forgery, allowing attackers to make unauthorized outbound HTTP requests, potentially exposing sensitive internal services. CVE-2026-73316 permits replay attacks on valid webhook payloads, leading to duplicate payments and unauthorized account upgrades. All vulnerabilities were published on 2026-09-08, and while exploitation is not confirmed, the risk is high for internet-facing deployments. Immediate remediation through vendor updates is advised, as the vulnerabilities pose significant threats to payment integrity and financial operations.
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