Microsoft: December security updates cause Message Queuing failures

BleepingComputer

December 15, 2025 at 9:04 AM

Overview

Microsoft has acknowledged that its December 2025 security updates are causing failures in Message Queuing (MSMQ) functionality. This issue is impacting enterprise applications and Internet Information Services (IIS) websites, potentially disrupting business operations. Users and organizations relying on these services may experience significant downtime and communication issues, as MSMQ is crucial for message delivery in distributed applications. Microsoft has not yet provided specific patches or workarounds to resolve this problem, leaving affected users in a challenging situation until a fix is released. This situation highlights the importance of thorough testing of security updates before deployment, especially in enterprise environments.

Key Takeaways

Affected Systems: Message Queuing (MSMQ), Internet Information Services (IIS), enterprise applications
Timeline: Disclosed on December 2025

Original Article Summary

Microsoft has confirmed that the December 2025 security updates are breaking Message Queuing (MSMQ) functionality, affecting enterprise applications and Internet Information Services (IIS) websites. [...]

Impact

Message Queuing (MSMQ), Internet Information Services (IIS), enterprise applications

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Disclosed on December 2025

Remediation

Not specified

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 Microsoft.

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