CVE-2026-22102 in DC-80
Summary
by MITRE • 07/13/2026
A POST request sent to a specific webserver endpoint can be used to write to arbitrary file locations. The endpoint accepts the filename parameter in the Content-Disposition header without verification. This can be used to cause a denial of service by overwriting system files, or remote-code-execution by overwriting shell-scripts which execution can be triggered through other means.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 07/13/2026
This vulnerability represents a critical server-side file inclusion flaw that allows unauthorized file manipulation through improperly validated input parameters. The specific weakness occurs within the webserver's handling of file upload operations where the filename parameter is extracted from the Content-Disposition header without adequate validation or sanitization. This design flaw enables attackers to manipulate the target file path and write content to arbitrary locations on the server filesystem, potentially compromising system integrity and operational continuity.
The technical implementation of this vulnerability stems from insufficient input validation within the web application's file handling logic. When processing POST requests containing file uploads, the server accepts the filename directly from the Content-Disposition header without performing proper path validation or sanitization checks. This allows attackers to inject malicious path sequences such as directory traversal patterns or absolute paths that bypass normal access controls and file system restrictions. The vulnerability is classified under CWE-22 as "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')" and can be leveraged for privilege escalation attacks through the ATT&CK technique T1059.007 "Command and Scripting Interpreter: PowerShell" when system scripts are overwritten.
The operational impact of this vulnerability extends beyond simple denial of service conditions to encompass potential remote code execution capabilities that could compromise entire server infrastructures. An attacker capable of overwriting critical system files or shell scripts can establish persistent access, escalate privileges, or disrupt normal service operations through strategic file replacement. The vulnerability's severity is amplified by the fact that it requires minimal reconnaissance and can be exploited through simple HTTP request manipulation, making it particularly dangerous in environments where web applications process untrusted file uploads from external sources.
Mitigation strategies should focus on implementing comprehensive input validation mechanisms including strict filename sanitization, path normalization, and access control enforcement. The recommended approach involves validating all file paths against a whitelist of acceptable directories, implementing proper file extension checks, and ensuring that uploaded files are stored in secure, isolated locations separate from system-critical directories. Additionally, the web application should enforce mandatory file type validation, implement proper authentication mechanisms for upload endpoints, and establish monitoring systems to detect unusual file modification patterns. Organizations should also consider implementing network segmentation, regular security assessments, and comprehensive incident response procedures to address potential exploitation attempts. The vulnerability demonstrates the critical importance of adhering to secure coding practices and implementing defense-in-depth strategies as outlined in industry standards such as NIST SP 800-53 and ISO/IEC 27001.