CVE-2026-30893: Wazuh Path Traversal Vulnerability

CVE-2026-30893 Overview

CVE-2026-30893 is a critical path traversal vulnerability affecting Wazuh, a widely-used open source security information and event management (SIEM) platform designed for threat prevention, detection, and response. The vulnerability exists in Wazuh's cluster synchronization extraction routine from version 4.4.0 to before version 4.14.4. An authenticated cluster peer can exploit this flaw to write arbitrary files outside the intended extraction directory on other cluster nodes, potentially leading to remote code execution and complete system compromise.

Critical Impact

This vulnerability allows authenticated attackers to achieve code execution in the Wazuh service context by overwriting Python modules loaded by Wazuh components. In deployments where the cluster daemon runs with elevated privileges, full system-level compromise is possible.

Affected Products

• Wazuh versions 4.4.0 through 4.14.3
• Wazuh cluster deployments with multiple nodes
• Systems running Wazuh cluster daemon with elevated privileges

Discovery Timeline

• 2026-04-29 - CVE-2026-30893 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-30893

Vulnerability Analysis

This vulnerability is classified as CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), commonly known as path traversal or directory traversal. The flaw resides in Wazuh's cluster synchronization mechanism, which is responsible for maintaining consistent state across multiple Wazuh cluster nodes.

The extraction routine fails to properly validate or sanitize file paths during the cluster synchronization process. When a cluster peer sends synchronization data containing specially crafted path sequences (such as ../ traversal patterns), the receiving node extracts files to locations outside the intended directory structure. This lack of path canonicalization allows an authenticated cluster peer to write arbitrary files anywhere on the filesystem that the Wazuh process has write access to.

Root Cause

The root cause of CVE-2026-30893 lies in insufficient input validation within the cluster synchronization extraction routine. The code responsible for handling incoming synchronization data does not properly sanitize or validate path components before file extraction operations. This allows directory traversal sequences to be processed, enabling writes outside the designated extraction directory boundary.

Attack Vector

The attack requires network access to the Wazuh cluster and authentication as a valid cluster peer. An attacker who has compromised one node in a Wazuh cluster, or who can impersonate a legitimate cluster peer, can craft malicious synchronization payloads containing path traversal sequences.

The exploitation flow involves:

1. The attacker establishes a connection as an authenticated cluster peer
2. Malicious synchronization data is sent containing files with traversal sequences in their paths (e.g., ../../etc/wazuh/python/module.py)
3. The target node's extraction routine processes the malicious paths without sanitization
4. Files are written outside the intended extraction directory
5. By overwriting Python modules loaded by Wazuh components, the attacker achieves code execution in the Wazuh service context

A proof of concept demonstrating code execution through Python module overwriting is available as documented in the security advisory. In deployments where the cluster daemon runs with root or elevated privileges, this vulnerability enables complete system-level compromise.

Detection Methods for CVE-2026-30893

Indicators of Compromise

• Unexpected file modifications outside of Wazuh's standard data directories, particularly in Python module paths
• Anomalous cluster synchronization activity or unusual file writes during synchronization operations
• Modified or newly created files in /var/ossec/framework/python/ or similar Wazuh Python module directories
• Suspicious process activity spawned by the Wazuh daemon after cluster synchronization events

Detection Strategies

• Monitor filesystem integrity of Wazuh installation directories, especially Python modules and configuration files
• Implement network monitoring for unusual cluster synchronization traffic patterns or payload sizes
• Deploy file integrity monitoring (FIM) on critical Wazuh directories to detect unauthorized modifications
• Review Wazuh cluster logs for anomalous peer connections or failed authentication attempts

Monitoring Recommendations

• Enable verbose logging for Wazuh cluster operations to capture synchronization events
• Configure alerts for any file writes outside expected Wazuh data directories during cluster sync
• Monitor process execution chains originating from Wazuh service processes for suspicious child processes
• Implement network segmentation monitoring to detect unauthorized cluster peer communication

How to Mitigate CVE-2026-30893

Immediate Actions Required

• Upgrade Wazuh to version 4.14.4 or later immediately to address this vulnerability
• Audit cluster peer authentication and ensure only trusted nodes are permitted to participate in cluster synchronization
• Review filesystem permissions to limit the Wazuh daemon's write access to only necessary directories
• Inspect Wazuh Python module directories for any unexpected modifications or unauthorized files

Patch Information

Wazuh has released version 4.14.4 which addresses this path traversal vulnerability. Organizations should upgrade to this version or later as soon as possible. The patch includes proper path validation and sanitization in the cluster synchronization extraction routine to prevent directory traversal attacks.

For detailed release information, see the GitHub Release v4.14.4. The complete security advisory is available at the GitHub Security Advisory GHSA-m8rw-v4f6-8787.

Workarounds

• Restrict network access to Wazuh cluster ports using firewall rules to limit exposure to trusted networks only
• Implement strict cluster peer authentication and certificate validation to prevent unauthorized peer connections
• Run the Wazuh cluster daemon with minimal privileges where operationally feasible to limit impact of exploitation
• Consider temporarily disabling cluster synchronization in high-risk environments until patching can be completed

# Example: Restrict cluster port access using iptables
# Allow cluster communication only from trusted peer IP addresses
iptables -A INPUT -p tcp --dport 1516 -s <trusted_peer_ip> -j ACCEPT
iptables -A INPUT -p tcp --dport 1516 -j DROP