CISA flags Apache ActiveMQ flaw as actively exploited in attacks

BleepingComputer

April 17, 2026 at 9:30 AM

Actively Exploited

Overview

The Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning about a significant vulnerability in Apache ActiveMQ that is currently being exploited by attackers. This flaw, which had remained undetected for 13 years, was patched earlier this month. ActiveMQ, widely used for messaging in enterprise applications, is at risk, meaning organizations that rely on this software could be compromised if they haven't applied the recent update. The urgency of the situation is underscored by the fact that attackers are actively leveraging this vulnerability, making it crucial for users to take immediate action to secure their systems. Companies using ActiveMQ should prioritize updating to the latest version to protect against potential intrusions.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Apache ActiveMQ, versions prior to the patch released in October 2023.
Action Required: Users should update to the latest version of Apache ActiveMQ as per the patch released in October 2023 to mitigate the vulnerability.
Timeline: Disclosed on October 2023

Original Article Summary

CISA warned that attackers are now exploiting a high-severity Apache ActiveMQ vulnerability, which was patched earlier this month after going undetected for 13 years. [...]

Impact

Apache ActiveMQ, versions prior to the patch released in October 2023.

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Disclosed on October 2023

Remediation

Users should update to the latest version of Apache ActiveMQ as per the patch released in October 2023 to mitigate the vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Vulnerability, Update, Apache.

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