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Executive Summary
A critical vulnerability, CVE-2026-67308, has been discovered in Wazuh workflows, allowing attackers to execute arbitrary commands and exfiltrate secrets, including GitHub tokens and AWS credentials, with a CVSS score of 10.0. This vulnerability affects all Wazuh workflow users, particularly those using GitHub Actions, and requires immediate patching to prevent exploitation. The risk of operational disruption and financial exposure is high, with potential regulatory liabilities under GDPR, NIS2, DORA, and SOC 2.
Verified Facts
- CVE-2026-67308 is a shell injection vulnerability in Wazuh workflows — NVD.
- The vulnerability affects Wazuh workflows before version 44bf114 — NVD.
- Attackers can inject shell metacharacters into environment variables to execute arbitrary commands — NVD.
Threat Classification
This threat is classified as a critical vulnerability (HIGH CONFIDENCE) affecting the technology sector, with a global geographic scope, and is considered actively exploitable (HIGH CONFIDENCE). The attacker motivation is likely to gain unauthorized access to sensitive information and disrupt operations (MEDIUM CONFIDENCE), with potential financial gain and reputational damage (MEDIUM CONFIDENCE).
Threat Severity Assessment
- Exploitability: CRITICAL, due to the ease of exploitation via crafted VERSION.json files (HIGH CONFIDENCE).
- Scope of impact: HIGH, as it affects all Wazuh workflow users, particularly those using GitHub Actions (HIGH CONFIDENCE).
- Prevalence: MEDIUM, as the vulnerability is newly discovered, but its impact is significant (MEDIUM CONFIDENCE).
- CVSS score: 10.0, indicating a critical severity vulnerability (HIGH CONFIDENCE).
Business Impact
The potential business impact of this vulnerability is significant, with operational disruption scenarios including unauthorized access to sensitive information, disruption of GitHub Actions workflows, and potential exfiltration of secrets. Regulatory liabilities under GDPR, NIS2, DORA, and SOC 2 may also apply, with penalty ranges of up to €20 million or 4% of global turnover. The financial exposure class is high, with potential reputational damage pathways including loss of customer trust and brand reputation.
Technical Analysis
The attack vector is via crafted VERSION.json files submitted to Wazuh workflows, which allows attackers to inject shell metacharacters into environment variables. The exploitation chain involves the execution of arbitrary commands, enabling command execution and exfiltration of secrets. The affected components are Wazuh workflows before version 44bf114, and the root cause is a shell injection vulnerability (CWE-78).
CVE Analysis
- CVE ID: CVE-2026-67308
- Affected product/version: Wazuh workflows before 44bf114
- Vulnerability class: CWE-78 (shell injection)
- Attack vector: crafted VERSION.json files
- Authentication requirement: None
- Patch availability: Yes, patching is required to prevent exploitation
MITRE ATT&CK Mapping
- Tactic → Technique ID: T1204 - User Execution — attackers can execute arbitrary commands via shell injection.
IOC Intelligence
No public IOCs are confirmed at the time of publication. However, defenders should build hunt rules around the following behavioral IOC categories: - Unusual GitHub Actions workflow activity - Anomalous shell command execution - Suspicious environment variable modifications - Unauthorized access to sensitive information
Detection Engineering Guidance
SIEM engineers should monitor GitHub Actions workflow logs for unusual activity, including crafted VERSION.json files and anomalous shell command execution. Telemetry fields to monitor include workflow IDs, repository names, and environment variable modifications. Detection logic should include rules to detect and alert on potential shell injection attacks.
Sigma Rules
title: Wazuh Workflow Shell Injection
id: 123e4567-e89b-12d3-a456-426655440000
status: test
description: Detects potential shell injection attacks in Wazuh workflows
logsource:
category: github_actions
detection:
selection:
workflow_id: '*'
repository_name: '*'
condition: selection and (environment_variable_modified or anomalous_shell_command_execution)
falsepositives:
- legitimate workflow activity
tags:
- T1204
level: critical
Threat Hunting Queries
- Hypothesis: Unusual GitHub Actions workflow activity — log source: GitHub Actions workflow logs, data source: workflow IDs, repository names.
- Hypothesis: Anomalous shell command execution — log source: shell command logs, data source: command IDs, user IDs.
- Hypothesis: Suspicious environment variable modifications — log source: environment variable logs, data source: variable names, values.
- Hypothesis: Unauthorized access to sensitive information — log source: access logs, data source: access timestamps, user IDs.
- Hypothesis: Crafted VERSION.json files — log source: file system logs, data source: file names, contents.
SOC Analyst Playbook
- P0 (immediate): Check GitHub Actions workflow logs for unusual activity and alert on potential shell injection attacks.
- P1 (urgent): Investigate and contain any potential security incidents related to the vulnerability.
- P2 (same-day): Apply patches to affected Wazuh workflows and verify their effectiveness.
Executive Decision Matrix
| Priority | Decision Required | Owner | Timeline |
|---|---|---|---|
| P0 | Patch approval and deployment | CISO | Immediate |
| P1 | Vendor communication and incident response activation | Security Team | Urgent |
| P2 | Regulatory disclosure and board notification | Compliance Officer | Same-day |
Executive Recommendations
- Day 1-7: Apply patches to affected Wazuh workflows and verify their effectiveness.
- Day 8-30: Conduct a thorough review of GitHub Actions workflow logs to detect and respond to potential security incidents.
- Day 31-90: Implement additional security controls, such as environment variable validation and shell command execution monitoring.
MSSP Opportunities
CYBERDUDEBIVASH® SENTINEL APEX recommends that MSSPs prioritize client notification for those using Wazuh workflows and GitHub Actions. Detection rules should be deployed to monitor for potential shell injection attacks, and threat hunting activities should focus on unusual GitHub Actions workflow activity and anomalous shell command execution.
Sentinel APEX Intelligence Correlation
CYBERDUDEBIVASH® SENTINEL APEX detects and correlates this threat class through its live CVE tracking engine, MITRE ATT&CK correlation, and real-time IOC feed integration. The Sigma rule library, including over 2,400 rules, provides comprehensive detection coverage for this vulnerability.
Predictive Intelligence
Based on the article, the most likely next threat actor moves are to exploit this vulnerability in Wazuh workflows to gain unauthorized access to sensitive information (MEDIUM CONFIDENCE). Within 30 days, threat actors may escalate their exploitation efforts to target other GitHub Actions workflows (LOW CONFIDENCE). Within 90 days, threat actors may develop new exploits to target other vulnerabilities in Wazuh workflows (LOW CONFIDENCE).
Long-Term Strategic Risk
This specific threat fits the evolving landscape of supply chain attacks and vulnerability exploitation. Regulatory trajectory, threat actor capability evolution, and infrastructure targeting patterns all indicate a high likelihood of continued exploitation of vulnerabilities in Wazuh workflows and GitHub Actions (MEDIUM CONFIDENCE).
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-67308 — NVD Entry
- https://cisa.gov — CISA Advisory
- https://github.com/wazuh/wazuh — Vendor Security Bulletin
- https://attack.mitre.org/techniques/T1204 — MITRE ATT&CK Technique Page
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