## CVE-2026-40466: Apache ActiveMQ Remote Code Execution Via HTTP Discovery Transport Bypass Confirmed
A critical remote code execution vulnerability in Apache ActiveMQ has been confirmed through template validation on a known vulnerable system. The flaw, tracked as CVE-2026-40466, exploits the HTTP Discovery Transport mechanism to bypass normal security controls and achieve arbitrary code execution on affected instances.

The vulnerability resides in how Apache ActiveMQ processes HTTP-based discovery requests during transport configuration. Attackers can manipulate discovery transport parameters to inject malicious payloads, circumventing authentication and executing commands with the privileges of the affected service. Security researchers developed a dedicated nuclei template to detect this vulnerability, validating it against a confirmed vulnerable deployment. The true positive result confirms that unpatched ActiveMQ instances remain exposed to remote compromise through this attack vector.

Organizations running Apache ActiveMQ should immediately assess their exposure and apply available patches. Any deployment with accessible HTTP discovery endpoints should be treated as high-priority for remediation, given the confirmed exploitability and remote code execution capability. Security teams are advised to audit network access controls and monitor for indicators of exploitation attempts targeting this vulnerability.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: CVE-2026-40466, remote code execution, HTTP Discovery Transport, vulnerability validation, nuclei template
- **Credibility**: unverified
- **Published**: 2026-05-04 14:54:12
- **ID**: 79284
- **URL**: https://whisperx.ai/en/intel/79284