CVE-2026-54992

Imagine a guarded door on your Windows system that has a weak spot in how it handles certain messages. If someone is already standing inside your building (local access), they may be able to push through that weak spot to make the system run attacker code. Even though it’s not a “network attack from outside,” it can still turn a local foothold into full control.

This matters if you run Windows with the Microsoft Message Queuing Queue Manager component on your endpoints or servers—especially any machines where an attacker could gain local access. The weakness does not require authentication or user interaction, but it does require the attacker to have local access to the vulnerable system. This is mainly a risk if a device is reachable only after someone gets onto it (for example via stolen credentials or malware already present), not from the public internet.

Verdict is RED because the flaw enables arbitrary code execution, which can turn a local foothold into complete compromise. While there’s no clear reporting of exploitation in the wild in the provided sources, this is still a serious patch-related issue for systems that could be accessed locally by an attacker.

Confirm exposure

• For each managed Windows 10/11 and Windows Server version in scope, determine the exact OS build number.
• Identify whether the Message Queuing Queue Manager component is installed/used on that machine (your IT admin console, server roles/features inventory, or vendor/application documentation may indicate whether it’s present).

Compare to fixed versions

• Apply updates so the OS build reaches one of the fixed versions below (choose the one that matches your OS line):
  • Windows 10: 10.0.14393.9339 or 10.0.17763.9020 or 10.0.19044.7548 or 10.0.19045.7548
  • Windows 11: 10.0.26100.8875 or 10.0.26200.8875 or 10.0.28000.2525
  • Windows Server 2012: 6.2.9200.26226
  • Windows Server 2012 R2: 6.3.9600.23291
  • Windows Server 2016: 10.0.14393.9339
  • Windows Server 2019: 10.0.17763.9020
  • Windows Server 2022: 10.0.20348.5386

Upgrade path / operational notes

• Use your standard Windows Update / patch management process for your environment.
• Plan a maintenance window if updates require reboot; prioritize servers and any devices that handle internal services where local access is plausible.

If patching is delayed (workarounds)

• Reduce the chance that an attacker can gain local access:
  • Remove unused local/admin accounts and disable unnecessary accounts.
  • Enforce least privilege and restrict who can log on locally.
  • Strengthen credential protections (MFA where applicable, password hygiene, disable legacy auth paths if used).
• Increase monitoring for local login and privilege changes (since the attack requires local access).

What to monitor

• After updates, verify the OS build matches one of the fixed versions above.
• Review logs for unusual local logins or attempts, because the precondition for exploitation is local access.

KEV / deadline

• No KEV listing was provided for this CVE, so no CISA due date is included in the supplied findings.

CVE-2026-54992 is a local heap-based buffer overflow (CWE-122) in Microsoft Message Queuing Queue Manager. The reported impact is arbitrary code execution on the target system when an attacker can gain local access to a vulnerable host. In the provided findings: authentication is not required and no user interaction is needed. KEV was not listed, and there was no clear dated press claim or evidence provided of exploitation in the wild, nor public exploit code on record. The presence of a patch indicates vendor remediation availability; fixed OS build numbers vary by Windows release line as listed in the findings.