AI Supply Chain Vulnerability in MCP Exposes Enterprises to Open‑Redirect Attacks

AI Supply Chain Vulnerability in MCP Exposes Enterprises to Open‑Redirect Attacks

What Happened — Researchers disclosed a critical flaw in the Model Control Plane (MCP) used by many AI‑enabled SaaS platforms. The vulnerability allows an attacker to craft malicious redirects that can hijack model‑inference requests, effectively turning the AI supply chain into a conduit for data exfiltration and code execution. Early proof‑of‑concept exploits demonstrate that compromised MCP endpoints can be leveraged to inject malicious payloads into downstream enterprise applications.

Why It Matters for TPRM —

• The MCP sits at the data‑layer boundary of AI services; a breach can cascade across all downstream vendors that consume the same model APIs.
• Traditional perimeter controls (firewalls, endpoint AV) do not detect these “open‑redirect” style attacks, creating blind spots in third‑party risk assessments.
• Remediation often requires coordinated changes across multiple SaaS providers, increasing remediation time and contractual exposure.

Who Is Affected —

• Cloud‑based AI/ML SaaS vendors (e.g., generative‑AI platforms, analytics services)
• Enterprises in finance, healthcare, and technology that integrate AI models via third‑party APIs
• Managed Service Providers that embed AI services into client environments

Recommended Actions —

• Conduct an immediate inventory of all third‑party AI model providers and map MCP endpoints used.
• Verify that providers have applied the disclosed patches or mitigations; request proof of remediation.
• Implement strict data‑layer governance: enforce input validation, enforce least‑privilege API tokens, and monitor redirect patterns.
• Update third‑party risk questionnaires to include AI supply‑chain security controls and open‑redirect testing.

Technical Notes —

• Vulnerability type: Open‑redirect / URL manipulation in the Model Control Plane.
• Attack vector: Crafted HTTP requests that manipulate the redirect_uri parameter, bypassing authentication checks.
• Exploited CVE: Not yet assigned; pending vendor disclosure.
• Data at risk: Model inference data, proprietary prompts, and potentially downstream business logic.
• Mitigation: Input sanitization, strict allow‑list of redirect destinations, and deployment of WAF rules targeting MCP endpoints.

Source: TechRepublic Security – The MCP Disclosure Is the AI Era’s ‘Open Redirect’ Moment