Microsoft Confirms Windows Security Updates Installation Issues

Microsoft has confirmed reports that the November 2026 security updates are failing to install on Windows 11 systems equipped with the October preview update. Users have reported that the KB5132061 update fails to install, causing the installation process to lock midway and trigger specific error codes.

“When attempting to install the November 2026 Windows security update (the Originating KBs listed above), some devices might be unable to complete the installation. Affected devices might repeatedly attempt to install the update or display error code 0x80070306, 0x800f0989, or 0x800f0993,” Microsoft stated in a service update seen by BleepingComputer.

The company noted that this issue impacts a limited number of devices that previously installed the October 2026 non-security preview update, specifically KB5127936. Systems that skipped the October preview update are not impacted by these installation failures.

Resolution and Previous Update Issues

IT administrators were informed that the installation problems will resolve automatically for all impacted customers by Friday morning, and end users do not need to take any action to receive the fix.

“All affected devices should be repaired in 24 to 48 hours starting from November 11, 2026, 10am PT. Once your device receives the repair, it will automatically download and install the November 2026 security update via Windows Update,” the company added, while urging administrators to contact support if issues persist past 48 hours.

This follows a series of update hurdles for Microsoft. In March, a buggy non-security preview update designated as KB5079391 was pulled due to installation errors. Additional installation failures and errors occurred in May with update KB5089549, and in June regarding devices upgraded to Windows 11 24H2 or 25H2.