CVE-2026-5607: SSRF in mcp-browser-agent

The SSRF vulnerability in mcp-browser-agent allows an attacker to craft malicious requests that the server will then execute on its behalf. This can be exploited to access internal services and resources that are not directly accessible from the outside world. For example, an attacker could potentially scan internal networks, access sensitive configuration files, or even interact with internal APIs. The ability to trigger arbitrary HTTP requests significantly expands the attack surface, potentially leading to data exfiltration or further compromise of the underlying infrastructure. The public disclosure of this vulnerability increases the risk of exploitation.

1. Reserved2026-04-05
2. Published2026-04-06
3. EPSS updated2026-04-13

The primary mitigation for CVE-2026-5607 is to upgrade to a patched version of mcp-browser-agent. Unfortunately, a fixed version is not yet available. As a temporary workaround, implement strict input validation on the request.params.name and request.params.arguments parameters within the URL Parameter Handler. Consider deploying a Web Application Firewall (WAF) with rules to block suspicious requests containing potentially malicious URLs. Regularly monitor logs for unusual outbound HTTP requests originating from the mcp-browser-agent component. After applying these mitigations, verify the effectiveness by attempting to trigger the SSRF vulnerability with a controlled malicious request.