CVE-2026-102811 in Marmite
Summary
by MITRE • 09/29/2026
Marmite through 0.4.2 contains missing authentication in the development server endpoints /__marmite__/content, /__marmite__/config, and /__marmite__/file/, allowing unauthenticated attackers to create, modify, and overwrite site content and configuration. Attackers can exploit unsanitized path parameters in handle_create_content and handle_clone_content to write files outside the project directory via directory traversal.
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified in Marmite versions through 0.4.2 represents a critical failure in access control mechanisms within its development server architecture. The core issue stems from missing authentication requirements on specific internal endpoints, namely /_marmite_/content, /_marmite_/config, and /_marmite_/file/. These endpoints are designed to facilitate content management and configuration updates during the development phase but lack any form of identity verification or session validation. This architectural oversight allows unauthenticated actors to interact directly with these interfaces over a network connection. In a typical deployment scenario where the development server is exposed beyond localhost, such as in cloud-based integrated development environments or misconfigured CI/CD pipelines, this flaw enables remote attackers to bypass security boundaries entirely. The absence of authentication transforms what should be protected administrative functions into publicly accessible operations, fundamentally undermining the integrity and confidentiality of the application environment.
Beyond simple unauthorized access, the vulnerability includes a severe path traversal component that exacerbates the risk profile significantly. When interacting with endpoints like handle_create_content and handle_clone_content, the server processes user-supplied file paths without adequate sanitization or validation against directory boundaries. Attackers can exploit this lack of input validation by injecting directory traversal sequences, such as ../, into their requests. This manipulation allows them to write files outside the intended project root directory. By overwriting system-critical configuration files, placing malicious scripts in executable directories, or modifying core application logic located elsewhere on the filesystem, an attacker gains a level of control that extends far beyond simple content modification. This capability effectively leads to arbitrary file write vulnerabilities, which are frequently precursors to remote code execution if the server subsequently loads and executes these manipulated files.
The operational impact of this vulnerability is substantial, particularly for development teams relying on Marmite for rapid prototyping or local testing where security controls might be relaxed by design but still expected to prevent accidental corruption. An unauthenticated attacker can create new content, modify existing site structures, and overwrite configuration settings at will. The ability to write files outside the project directory introduces a risk of system-wide compromise. If an attacker manages to place a web shell or malicious script in a location that is served by another process or included by other application components, they can achieve full remote code execution on the host machine. This could lead to data exfiltration, lateral movement within internal networks if the development server has broader network access, and complete denial of service through file system corruption. The integrity of the entire software supply chain is compromised as malicious changes made during development may be inadvertently committed to version control systems or deployed to production environments.
From a classification perspective, this vulnerability aligns with CWE-287 Improper Authentication, as the server fails to verify identity before granting access to sensitive endpoints. It also maps directly to CWE-22 Path Traversal: '..' Sequence, due to the unsanitized handling of file paths that allows navigation outside restricted directories. In terms of offensive security frameworks, this behavior corresponds to MITRE ATT&CK techniques involving Initial Access via Exploitation of Remote Services and Persistence or Privilege Escalation through File Manipulation. The combination of missing authentication and path traversal creates a high-severity exploit chain that requires immediate attention from development teams.
Mitigation strategies must focus on both architectural changes and configuration hardening. First, the most effective remediation is to disable these internal endpoints in any environment other than strictly local, isolated testing scenarios where no external network access exists. If remote access is required for collaborative development, strict authentication mechanisms such as OAuth2 or API key validation should be implemented specifically for these routes. Input validation must also be enforced rigorously; all file path parameters passed to handle_create_content and handle_clone_content must be sanitized to ensure they resolve within the designated project root directory using canonicalization techniques that prevent traversal sequences from altering the intended target path. Additionally, developers should review their deployment pipelines to ensure that development servers are not inadvertently exposed to public networks or internal production subnets without proper firewall rules restricting access to trusted IP ranges only. Regular security audits of third-party dependencies and keeping Marmite updated to versions where these flaws have been patched is essential for maintaining a secure development posture.