CVE-2026-41419: 4ga Boards Path Traversal Vulnerability

CVE-2026-41419 Overview

CVE-2026-41419 is a path traversal vulnerability affecting 4ga Boards, a realtime project management boards system. Prior to version 3.3.5, an authenticated user with board import privileges can exploit this flaw to force the server to ingest arbitrary host files as board attachments during BOARDS archive import operations. Once successfully imported, these files become accessible through the normal application interface, resulting in unauthorized local file disclosure.

Critical Impact
Authenticated attackers can read sensitive files from the server filesystem, potentially exposing configuration files, credentials, and other confidential data through the board attachment download functionality.

Affected Products

4ga Boards versions prior to 3.3.5

Discovery Timeline

2026-04-24 - CVE CVE-2026-41419 published to NVD
2026-04-27 - Last updated in NVD database

Technical Details for CVE-2026-41419

Vulnerability Analysis

This path traversal vulnerability (CWE-22) exists in the BOARDS archive import functionality of 4ga Boards. The application fails to properly sanitize file path references within imported archive files, allowing an attacker to craft malicious archives containing path traversal sequences that reference files outside the intended upload directory.

When a user with board import privileges uploads a specially crafted BOARDS archive, the server processes the contained file references without adequate validation. By including relative path components such as ../ sequences in the archive's attachment references, an attacker can direct the server to read arbitrary files from the host filesystem and store them as legitimate board attachments.

The attack requires authentication and board import privileges, which limits the attack surface but still presents a significant risk in multi-tenant or shared environments where users may have varying trust levels.

Root Cause

The vulnerability stems from insufficient input validation during the BOARDS archive import process. The application does not properly sanitize or validate file paths extracted from the imported archive, allowing directory traversal sequences to escape the intended attachment directory and reference arbitrary files on the host system.

Attack Vector

The attack is conducted over the network by an authenticated user. The attacker crafts a malicious BOARDS archive file containing path traversal sequences pointing to sensitive system files. Upon import, the server processes these paths without proper sanitization, reads the referenced files from the filesystem, and stores them as board attachments. The attacker can then download these attachments through the standard application interface to exfiltrate the contents of arbitrary files.

For example, an attacker might include a reference like ../../../../etc/passwd within the archive, causing the server to read and store the system's password file as an accessible attachment. Additional details are available in the GitHub Security Advisory.

Detection Methods for CVE-2026-41419

Indicators of Compromise

Unusual BOARDS archive import activity from user accounts
Board attachments containing content from system files (e.g., /etc/passwd, configuration files)
Import operations with file references containing ../ path traversal sequences
Unexpected file access patterns in server logs during import operations

Detection Strategies

Monitor board import functionality for archives containing suspicious path references
Implement file integrity monitoring on sensitive system directories
Review application logs for path traversal patterns in import operations
Audit attachment download activity for files that shouldn't exist as legitimate board content

Monitoring Recommendations

Enable verbose logging for the BOARDS archive import functionality
Configure alerting on file access attempts outside the designated attachment directories
Monitor for rapid sequential downloads of board attachments by single users
Implement anomaly detection for unusual import patterns or file sizes

How to Mitigate CVE-2026-41419

Immediate Actions Required

Upgrade 4ga Boards to version 3.3.5 or later immediately
Audit recent board import activity for suspicious patterns or unauthorized file access
Review existing board attachments for any that may contain sensitive system file content
Restrict board import privileges to trusted users only until patch is applied

Patch Information

The vulnerability has been addressed in 4ga Boards version 3.3.5. Organizations should upgrade to this version or later to remediate the path traversal vulnerability. The fix implements proper path validation and sanitization during the BOARDS archive import process.

For complete details, refer to the GitHub Security Advisory.

Workarounds

Temporarily disable the board import functionality until the patch can be applied
Restrict board import privileges to administrators only
Implement network-level controls to limit access to the import functionality
Run the application with minimal filesystem permissions to limit exposure of sensitive files

bash

# Example: Restricting file permissions for 4ga Boards service account
# Limit read access to only required directories
chmod -R o-rwx /etc/sensitive-configs/
chown -R root:root /etc/sensitive-configs/