Summary
Opcenter RDnL is affected by missing authentication in critical function in ‘ActiveMQ Artemis’. An unauthenticated attacker within the adjacent network could use the Core protocol to force a target broker to establish an outbound Core federation connection to an attacker-controlled rogue broker. This could potentially result in availability impacts or message injection into any queue via the rogue broker. Breaking the integrity of a message has a low impact due to missing auto refresh functionality and it does not contain any confidential information.
ActiveMQ Artemis has released a new version and Siemens recommends to update to the latest version.
Vulnerabilities 1
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Critical 9.3CVE-2026-27446 EPSS 11%
Apache Artemis, Apache ActiveMQ Artemis: Auth bypass for Core downstream federation
Missing Authentication for Critical Function (CWE-306) vulnerability in Apache Artemis, Apache ActiveMQ Artemis. An unauthenticated remote attacker can use the Core protocol to force a target broker to establish an outbound Core federation connection to an at…
Revision history
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#2
Initial CISA Republication of Siemens ProductCERT SSA-085541 advisory
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#1
Publication Date
References
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SSA-085541: Missing Authentication in Critical Function in ActiveMQ Artemis (CVE-2026-27446) in Opcenter RDnL - HTML Version
https://cert-portal.siemens.com/productcert/html/ssa-085541.html
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ICS Advisory ICSA-26-134-09 - Web Version
https://www.cisa.gov/news-events/ics-advisories/icsa-26-134-09
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Recommended Practices
https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01
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Recommended Practices
https://www.cisa.gov/resources-tools/resources/ics-recommended-practices
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Recommended Practices
https://www.cisa.gov/topics/industrial-control-systems
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Recommended Practices
https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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Recommended Practices
https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf
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Recommended Practices
https://www.cisa.gov/news-events/news/targeted-cyber-intrusion-detection-and-mitigation-strategies-update-b