CVE-2025-69601 in 66biolinks
Summary
by MITRE • 01/28/2026
A directory traversal (Zip Slip) vulnerability exists in the “Static Sites” feature of 66biolinks v44.0.0 by AltumCode. Uploaded ZIP archives are automatically extracted without validating or sanitizing file paths. An attacker can include traversal sequences (e.g., ../) in ZIP entries to write files outside the intended extraction directory. This allows static files (html, js, css, images) file write to unintended locations, or overwriting existing HTML files, potentially leading to content defacement and, in certain deployments, further impact if sensitive files are overwritten.
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Analysis
by VulDB Data Team • 02/10/2026
The vulnerability identified as CVE-2025-69601 represents a critical directory traversal flaw within the Static Sites feature of 66biolinks version 44.0.0, developed by AltumCode. This issue stems from insufficient input validation during the automatic extraction of uploaded ZIP archives, creating a pathway for malicious actors to manipulate file paths and execute unauthorized file operations. The flaw specifically affects the extraction process where the application fails to sanitize or validate file paths contained within ZIP archives, allowing attackers to exploit the absence of proper path validation controls.
The technical implementation of this vulnerability follows the classic Zip Slip attack pattern where malicious ZIP files contain entries with traversal sequences such as ../ or ..\ that bypass normal extraction boundaries. When the application extracts these archives without proper path sanitization, it allows the attacker to write files to arbitrary locations on the server filesystem. This occurs because the extraction logic does not properly canonicalize or validate the file paths contained within the ZIP archive entries, enabling path traversal attacks that can overwrite existing files or create new files in unintended directories. The vulnerability is classified as CWE-22 according to the Common Weakness Enumeration, which specifically addresses improper limitation of a pathname to a restricted directory.
The operational impact of this vulnerability extends beyond simple content defacement, as it provides attackers with the capability to overwrite critical static files including html, css, js, and image resources that form the website's presentation layer. In environments where the web application has elevated privileges or where sensitive files are stored in predictable locations relative to the web root, this vulnerability could enable more severe consequences including the potential to overwrite configuration files, inject malicious code, or establish persistent backdoors through the manipulation of static assets. The attack vector requires minimal sophistication as it only requires uploading a specially crafted ZIP file containing malicious path sequences, making it particularly dangerous in scenarios where users can upload files to the system.
Mitigation strategies for this vulnerability must address the fundamental flaw in the file extraction process through comprehensive path validation and sanitization. Organizations should implement strict input validation that rejects or normalizes any file paths containing traversal sequences before extraction occurs, utilizing canonical path resolution techniques to ensure that extracted files remain within the intended directory boundaries. The recommended approach includes implementing proper path validation logic that checks for and removes or rejects any path components that attempt to traverse outside the target extraction directory. Additionally, deployment configurations should enforce restrictive file permissions and ensure that the application runs with minimal necessary privileges to limit the potential impact of successful exploitation. This vulnerability demonstrates the importance of following secure coding practices and adheres to ATT&CK technique T1059.007 for execution through web shell creation, highlighting the need for robust input validation and secure file handling mechanisms in web applications.