CVE-2026-97875 in Rojo
Summary
by MITRE • 09/25/2026
Rojo's "rojo serve" HTTP API (default port 34872) has no Host/Origin header validation, making it vulnerable to DNS rebinding. A malicious webpage can read all project source, write malicious code to files on disk, and launch local programs via opener::open() with no user interaction beyond visiting the page.
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Analysis
by VulDB Data Team • 09/25/2026
The vulnerability identified in Rojo's serve HTTP API represents a critical security flaw rooted in the absence of proper origin validation mechanisms for incoming requests. The service operates by default on port 34872 and exposes an interface that allows clients to interact with project source code, write files to disk, and execute local programs through functions such as opener::open(). Because this API lacks Host or Origin header verification, it fails to distinguish between legitimate internal traffic and malicious external requests. This omission creates a direct pathway for DNS rebinding attacks, where an attacker controls the domain name resolution process to make a request appear as if it originates from localhost or another trusted local address. By manipulating Domain Name System responses during the connection phase, an adversary can bypass same-origin policies that typically restrict web pages from accessing resources on different domains or ports within the local network environment.
The operational impact of this vulnerability is severe due to the high-privilege nature of the exposed API endpoints. A malicious webpage hosted by an attacker does not require any user interaction beyond convincing a victim to visit the page, leveraging cross-site request forgery principles combined with DNS rebinding techniques. Once connected, the attacker gains unrestricted read access to all project source files stored in the local development environment. This exposure can lead to the leakage of sensitive intellectual property, API keys, configuration secrets, or other confidential data embedded within the codebase. Furthermore, the ability to write malicious code directly to disk allows an adversary to plant backdoors, modify existing scripts for persistence, or corrupt project integrity without detection by standard file system permissions if the service runs with elevated privileges.
The capability to launch local programs via opener::open() elevates this vulnerability from a data exposure risk to a full remote code execution scenario. By exploiting this function through DNS rebinding, an attacker can execute arbitrary commands on the victim's machine under the context of the user running the Rojo service. This effectively grants complete control over the development environment, enabling further lateral movement within the local network or escalation of privileges depending on the runtime permissions. The combination of file system write access and command execution capability means that a single visit to a crafted webpage can result in total compromise of the workstation's security posture, including potential installation of malware or establishment of persistent remote access channels.
Mitigation strategies must focus on implementing strict origin validation at the application layer rather than relying solely on network-level assumptions. The Rojo serve API should be configured to accept requests only from explicitly trusted origins by validating both the Host and Origin headers against a whitelist of allowed domains. Additionally, binding the service exclusively to localhost interfaces while ensuring that firewall rules do not expose port 34872 to external networks can reduce the attack surface. If remote access is required, implementing mutual TLS authentication or token-based authorization mechanisms would provide stronger guarantees of client identity. Developers should also audit third-party dependencies for similar vulnerabilities and ensure that development tools are run with minimal necessary privileges to limit the impact of potential exploitation events aligned with CWE-346 improper validation of origin in web applications and ATT&CK technique T1078 valid accounts or local system access via browser-based attacks.