CVE-2026-41176 Scanner

Rclone is a command-line program widely used for managing files on cloud storage. It is commonly utilized by IT administrators and developers to facilitate data transfer and synchronization across various cloud and remote storage services. Rclone operates on multiple operating systems, offering a flexible and powerful tool to ensure cloud data management and backup tasks. Its expansive user base takes advantage of Rclone's extensive compatibility, supporting numerous protocols and cloud storage providers. Rclone is particularly favored for its ability to perform automated scripts in backup routines and complex data migrations. Users rely on Rclone for secure and efficient file operations in business and personal applications globally.

The Missing Authorization vulnerability in Rclone allows unauthenticated access due to deficient authentication controls in the RC endpoint `options/set`. This vulnerability can be exploited when the RC server is started without global HTTP authentication. It results from improper checks that allow unauthorized users to modify global runtime configuration. Exploiting this flaw, attackers can bypass security measures intended to restrict access to sensitive functionalities. Such vulnerabilities expose the system to potential unauthorized changes by malicious actors, severely compromising the integrity of the service. This vulnerability type is critical as it undermines the fundamental security mechanisms of the affected application.

The vulnerability arises from the RC endpoint `options/set` not properly enforcing authentication, specifically when global HTTP authentication is disabled. A POST request exploiting this flaw can alter the NoAuth setting, thereby manipulating the server's authentication requirements. This technical oversight allows attackers to access sensitive administrative functions without proper credentials. The affected endpoint thus becomes a gateway for unauthorized users, capable of performing high-impact operations typically restricted to authenticated users. Attackers can use standard HTTP requests to exploit this oversight if unauthorized network accessibility is available. The vulnerability requires no specialized content or rare entry points, making it more dangerous.

Exploiting the Missing Authorization vulnerability can result in malicious users obtaining full control over the RC server configuration and operations. Attackers may alter or disable important security settings, potentially leading to unauthorized data access and data corruption. Additionally, the vulnerability could be used to deploy further attacks through the compromised system, as attackers gain insight into server operations. This lack of control could lead to data leakage or service disruptions, affecting both availability and confidentiality. In critical environments, exploitation could potentially cause severe operational disruptions or loss of sensitive information, impacting business reputation and stakeholder trust.

REFERENCES

• https://github.com/rclone/rclone/security/advisories/GHSA-25qr-6mpr-f7qx
• https://nvd.nist.gov/vuln/detail/CVE-2026-41176