CVE-2026-22249 in Docmost
Summary
by MITRE • 01/15/2026
Docmost is an open-source collaborative wiki and documentation software. From 0.21.0 to before 0.24.0, Docmost is vulnerable to Arbitrary File Write via Zip Import Feature (ZipSlip). In apps/server/src/integrations/import/utils/file.utils.ts, there are no validation on filename. This vulnerability is fixed in 0.24.0.
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Analysis
by VulDB Data Team • 01/24/2026
The vulnerability CVE-2026-22249 affects Docmost, an open-source collaborative wiki and documentation platform, specifically within versions 0.21.0 through 0.23.0. This issue resides in the zip import functionality that allows users to import content from zip archives into the documentation system. The flaw manifests in the file.utils.ts module located at apps/server/src/integrations/import/utils/file.utils.ts where the application fails to validate filenames during the extraction process. This lack of input validation creates a critical security gap that enables attackers to manipulate the file extraction process and write arbitrary files to the server filesystem. The vulnerability is classified as a ZipSlip attack vector, which exploits the common practice of extracting zip files without proper path validation, allowing attackers to traverse directories and overwrite critical system files or inject malicious content.
The technical implementation of this vulnerability occurs when the application processes zip archives containing specially crafted filenames that include directory traversal sequences such as ../ or ..\.. This allows the attacker to specify absolute paths or paths that escape the intended extraction directory. The absence of filename validation in the file.utils.ts module means that the application accepts and processes these malicious paths without sanitization, leading to arbitrary file write operations. This vulnerability directly maps to CWE-22 - Improper Limitation of a Pathname to a Restricted Directory and aligns with ATT&CK technique T1059.007 - Command and Scripting Interpreter: Python, as attackers can leverage this to execute malicious code through file injection. The impact extends beyond simple file manipulation to potential system compromise, as attackers could overwrite configuration files, inject backdoors, or replace critical executables.
The operational impact of this vulnerability is severe for organizations relying on Docmost for collaborative documentation, as it provides a direct path for remote code execution and system compromise. Attackers can exploit this vulnerability to gain persistent access to the server, potentially leading to data breaches, service disruption, or lateral movement within the network. The vulnerability affects the core import functionality of the application, making it a high-risk issue that could be exploited by both authenticated and unauthenticated attackers depending on the system configuration. Organizations using affected versions should consider this vulnerability as a critical threat that could allow attackers to establish persistent footholds in their documentation infrastructure, potentially leading to broader security incidents.
Mitigation strategies for CVE-2026-22249 include immediate upgrade to Docmost version 0.24.0 or later where the vulnerability has been patched. System administrators should also implement network-level restrictions to limit access to the import functionality where possible, and consider deploying additional monitoring to detect unusual file creation patterns in the application directory. The fix implemented in version 0.24.0 should include proper filename validation and sanitization to prevent directory traversal sequences from being processed during zip extraction. Organizations should also conduct thorough security assessments of their Docmost installations to identify any potential compromise from prior exploitation attempts. Additional defensive measures include implementing strict file access controls, regular security scanning of imported content, and maintaining detailed audit logs of file operations to detect potential exploitation attempts. The vulnerability demonstrates the importance of input validation in file processing operations and highlights the need for security-conscious development practices that prevent path traversal attacks in archive handling components.