Marmite Missing Authentication and Path Traversal Vulnerabilities

Executive Summary

CVE-2026-102811 is a vulnerability in Marmite through version 0.4.2 that allows unauthenticated attackers to access and modify site content and configuration via the development server. The flaw exists in endpoints /__marmite__/content, /__marmite__/config, and /__marmite__/file/ due to missing authentication. Attackers can exploit unsanitized path parameters to perform directory traversal, enabling file writes outside the intended project directory.

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Detection Guidance

Check if the Marmite development server is running on port 8000 by using commands like 'netstat -tulnp | grep 8000' or 'ss -tulnp | grep 8000'. Inspect network traffic for unauthorized access to endpoints like /__marmite__/content, /__marmite__/config, or /__marmite__/file/ using tools like tcpdump or Wireshark.

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Impact Analysis

This vulnerability allows attackers to create, modify, or overwrite site content and configuration without authentication. They can exploit directory traversal to write files outside the project directory, potentially leading to system compromise, data loss, or unauthorized access to sensitive files. The impact is limited to the development server mode and does not affect static site deployments.

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Mitigation Strategies

Stop using the Marmite development server immediately. Update to the latest version if a patch is available. Ensure the server is not exposed to external networks by binding it to localhost (127.0.0.1:8000) instead of all interfaces (0.0.0.0:8000).

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