Recent Apache ActiveMQ Vulnerability Exploited in the Wild

Organizations are warned that a recently patched vulnerability affecting Apache ActiveMQ Classic is being exploited in the wild. The flaw is tracked as CVE-2026-34197 and it came to light roughly 10 days ago, after it lurked in the software’s code for 13 years. It has been patched with the release of versions 5.19.5 and 6.2.3. Apache ActiveMQ is an open source, multi-protocol message broker that enables reliable, asynchronous communication between applications.  CVE-2026-34197 is related to the Jolokia API and can allow an authenticated attacker to execute arbitrary code. Horizon3, whose researchers discovered the vulnerability and published details on April 7, pointed out that while exploitation of CVE-2026-34197 requires authentication, many Apache ActiveMQ instances are protected by widely-known default credentials. In addition, CVE-2026-34197 can be chained with an older vulnerability tracked as CVE-2024-32114 to achieve unauthenticated remote code execution. The cybersecurity agency CISA added CVE-2026-34197 to its Known Exploited Vulnerabilities (KEV) catalog on Thursday, instructing federal agencies to patch it by April 30. No details appear to be publicly available about the attacks exploiting the vulnerability. However, Fortinet has seen dozens of exploitation attempts in the past week.  SecurityWeek has reached out to the cybersecurity firm for more information on the nature of these exploitation attempts. Related: Microsoft Patches Exploited SharePoint Zero-Day and 160 Other Vulnerabilities Related: Exploited Vulnerability Exposes Nginx Servers to Hacking Related: Cisco Patches Critical Vulnerabilities in Webex, ISE WRITTEN BY Eduard Kovacs Eduard Kovacs (@EduardKovacs) is senior managing editor at SecurityWeek. He worked as a high school IT teacher before starting a career in journalism in 2011. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering. More from Eduard Kovacs OpenAI Widens Access to Cybersecurity Model After Anthropic’s Mythos Reveal Data Breach at Tennessee Hospital Affects 337,000 Microsoft Paid Out $2.3 Million at Zero Day Quest 2026 Hacking Contest Claude Code, Gemini CLI, GitHub Copilot Agents Vulnerable to Prompt Injection via Comments Exploited Vulnerability Exposes Nginx Servers to Hacking $10 Domain Could Have Handed Hackers 25k Endpoints, Including in OT and Gov Networks ICS Patch Tuesday: 8 Industrial Giants Publish New Security Advisories Microsoft Patches Exploited SharePoint Zero-Day and 160 Other Vulnerabilities Latest News In Other News: Satellite Cybersecurity Act, $90K Chrome Flaw, Teen Hacker Arrested Another DraftKings Hacker Sentenced to Prison Lawmakers Gathered Quietly to Talk About AI. Angst and Fears of ‘Destruction’ Followed Two North Korean IT Worker Scheme Facilitators Jailed in the US ZionSiphon Malware Targets ICS in Water Facilities Cursor AI Vulnerability Exposed Developer Devices 53 DDoS Domains Taken Down by Law Enforcement Government Can’t Win the Cyber War Without the Private Sector Trending Webinar: A Step-By-Step Approach To AI Governance April 28, 2026 With "Shadow AI" usage becoming prevalent in organizations, learn how to balance the need for rapid experimentation with the rigorous controls required for enterprise-grade deployment. Register Virtual Event: Threat Detection And Incident Response Summit May 20, 2026 Delve into big-picture strategies to reduce attack surfaces, improve patch management, conduct post-incident forensics, and tools and tricks needed in a modern organization. Register People on the Move ThreatModeler has appointed Kevin Gallagher as Chief Executive Officer. Thomas Bain has been appointed Chief Marketing Officer at Silent Push. The United States Department of War appointed David Vaughn as Technical Advisor for Data Infrastructure. More People On The Move Expert Insights Government Can’t Win The Cyber War Without The Private Sector Securing national resilience now depends on faster, deeper partnerships with the private sector. (Steve Durbin) The Hidden ROI Of Visibility: Better Decisions, Better Behavior, Better Security Beyond monitoring and compliance, visibility acts as a powerful deterrent, shaping user behavior, improving collaboration, and enabling more accurate, data-driven security decisions. (Joshua Goldfarb) The New Rules Of Engagement: Matching Agentic Attack Speed The cybersecurity response to AI-enabled nation-state threats cannot be incremental. It must be architectural. (Nadir Izrael) The Next Cybersecurity Crisis Isn’t Breaches—It’s Data You Can’t Trust Data integrity shouldn’t be seen only through the prism of a technical concern but also as a leadership issue. (Steve Durbin) Why Agentic AI Systems Need Better Governance – Lessons From OpenClaw Agentic AI platforms are shifting from passive recommendation tools to autonomous action-takers with real system access, (Etay Maor) Flipboard Reddit Whatsapp Email