CVE-2026-28373: Stackfield Desktop Path Traversal Flaw

CVE-2026-28373 Overview

CVE-2026-28373 is a path traversal vulnerability in the Stackfield Desktop App before version 1.10.2 for macOS and Windows. The vulnerability exists in the application's decryption functionality when processing the filePath property. An attacker can craft a malicious export file that, when processed by the victim, writes arbitrary content to any path on the victim's filesystem, potentially leading to remote code execution.

Critical Impact

Attackers can achieve arbitrary file write capabilities on victim systems, enabling remote code execution through malicious export files. The vulnerability allows writing to any location on the filesystem with the privileges of the running application.

Affected Products

• Stackfield Desktop App for macOS (versions prior to 1.10.2)
• Stackfield Desktop App for Windows (versions prior to 1.10.2)

Discovery Timeline

• 2026-04-03 - CVE-2026-28373 published to NVD
• 2026-04-07 - Last updated in NVD database

Technical Details for CVE-2026-28373

Vulnerability Analysis

This path traversal vulnerability (CWE-22) affects the Stackfield Desktop App's decryption functionality. When the application processes export files, it fails to properly sanitize the filePath property before using it to determine the destination path for decrypted content. This allows an attacker to include directory traversal sequences (such as ../) in the file path, enabling files to be written outside of the intended directory.

The attack requires user interaction—specifically, the victim must process a maliciously crafted export file. However, since Stackfield is a collaboration platform, attackers could potentially share malicious exports through the platform itself, increasing the likelihood of successful exploitation in targeted attacks.

Root Cause

The root cause of this vulnerability is improper input validation of the filePath property within the decryption functionality. The application does not adequately sanitize or validate user-controlled file paths before performing file write operations. This allows path traversal sequences to escape the intended output directory, resulting in arbitrary file writes to locations controlled by the attacker.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker must craft a malicious export file containing path traversal sequences in the filePath property and convince a victim to process this export within the Stackfield Desktop App. The vulnerability enables arbitrary file write with the privileges of the application, which can be leveraged to achieve remote code execution by:

1. Overwriting configuration files or startup scripts
2. Writing malicious executables to auto-start locations
3. Replacing legitimate application files with malicious versions
4. Writing to system directories if the application runs with elevated privileges

For detailed technical analysis and exploitation methodology, refer to the RCE Security Analysis.

Detection Methods for CVE-2026-28373

Indicators of Compromise

• Unexpected file creation or modification in system directories, startup folders, or user configuration locations
• Stackfield Desktop App writing files outside of its designated export/download directories
• Files with path traversal artifacts (encoded sequences like %2e%2e%2f or literal ../) in Stackfield-related logs or network traffic
• Suspicious export files received through the Stackfield platform from unknown or compromised accounts

Detection Strategies

• Monitor file system activity for the Stackfield Desktop App process, alerting on writes to sensitive directories such as startup folders, system32, or application directories
• Implement endpoint detection rules to identify path traversal patterns in file operations originating from Stackfield processes
• Analyze network traffic for Stackfield export files containing suspicious filePath values with directory traversal sequences
• Deploy behavior-based detection to flag unusual file write operations that deviate from normal Stackfield application behavior

Monitoring Recommendations

• Enable detailed file system auditing on endpoints running Stackfield Desktop App to capture all file creation and modification events
• Configure SIEM rules to correlate Stackfield process activity with file writes to high-risk locations
• Review Stackfield application logs for error messages or anomalies during export processing
• Implement integrity monitoring on critical system files and startup locations to detect unauthorized modifications

How to Mitigate CVE-2026-28373

Immediate Actions Required

• Update Stackfield Desktop App to version 1.10.2 or later immediately on all macOS and Windows endpoints
• Audit recent Stackfield exports processed on endpoints for signs of exploitation
• Implement application whitelisting or endpoint protection to prevent unauthorized file writes from the Stackfield process
• Educate users about the risks of processing export files from untrusted sources within the Stackfield platform

Patch Information

Stackfield has released version 1.10.2 of the Desktop App for both macOS and Windows platforms, which addresses this path traversal vulnerability. Organizations should update to this version as the primary remediation measure. For more information about the Stackfield Desktop App, visit the official Stackfield Desktop Apps page. Additional security advisory details are available from RCE Security.

Workarounds

• Restrict users from processing Stackfield exports from untrusted or external sources until the patch is applied
• Implement network-level controls to inspect Stackfield-related traffic for malicious export files
• Use endpoint protection solutions to monitor and block suspicious file write operations from the Stackfield application
• Consider temporarily disabling export functionality in Stackfield environments where immediate patching is not feasible

# Configuration example
# Verify Stackfield Desktop App version on macOS
defaults read /Applications/Stackfield.app/Contents/Info.plist CFBundleShortVersionString

# Verify Stackfield Desktop App version on Windows (PowerShell)
(Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" | Where-Object { $_.DisplayName -like "*Stackfield*" }).DisplayVersion

# Block Stackfield from writing to sensitive directories using Windows Defender Application Control (example policy)
# Ensure version is 1.10.2 or higher before allowing normal operation