What Happened
Microsoft warned customers that the November 2026 security updates may break printing for documents with complex formatting. BleepingComputer reported the warning on 13 November 2026 and describes Windows printing issues that appear once those updates are installed.
That is the whole of what has been published. No CVE is named, no exploited flaw is described, and no attacker appears in the story. This is a functional regression that arrives with a security update, which is a different problem from a breach, and still a problem that lands on the service desk.
For an MSP, the cost shows up as tickets. Printing failures are loud and immediate. A user notices the moment a document does not come out, and the call arrives before you have any context. If the same update went to every managed endpoint in one push, you spend the day diagnosing one root cause many times, often with a client asking why the patch process broke the thing they use most.
The practical response is to slow the rollout, test on a small group, and decide with each client what to do about the updates. That choice is easier when you already know which clients print formatted documents as part of their daily work.
Timeline
One date has been published for this report.
- 13 November 2026: BleepingComputer reports that Microsoft warned customers the November 2026 security updates may break printing for documents with complex formatting.
Who Is Affected
The affected items as stated are the November 2026 security updates and documents with complex formatting.
In practice, that means any Windows environment that has taken the updates and regularly prints formatted documents. The report does not define complex formatting, so treat any non-trivial document layout as worth testing rather than guessing what Microsoft meant.
MSPs who support document-heavy clients carry most of this work. So do internal IT teams with the same printing patterns. The report names no specific industries, sectors or organisations.
Technical Details
No CVE is listed for this issue. The product named is Windows, in the context of Microsoft's November 2026 security updates. No version numbers are given beyond the month of the updates.
There is no attack vector described. BleepingComputer reports a side effect of installing the updates, not an attacker using them. The report does not say which printer models, drivers or applications are involved, and it does not describe a workaround.
Windows Printing Issues and the Cost of a Broad Rollout
A printing regression is not a breach, but it is an outage for the people who hit it. Invoices, shipping paperwork, contracts and reports can all stall when a document will not print, and the client does not care that the cause is a security update. They care that work has stopped.
The damage scales with how fast you pushed. An MSP that deploys updates to every managed endpoint on day one has no pilot data and no small blast radius to learn from. An MSP that stages updates finds the problem on a handful of machines, documents it, and chooses a course before the wider fleet is touched.
This is not an argument against patching. Security updates close real holes, and standing still trades one visible problem for a quieter and worse one. The argument is for staging, testing and knowing what your clients actually do with the software you manage.
What MSPs Should Do
Until Microsoft publishes more detail, treat this as a patch-quality problem and manage it like any risky rollout. These steps are standard practice for a security update that may break a business process.
- Find out which clients have taken the November 2026 updates and which of them print complex documents as part of their daily work.
- Pause any remaining broad deployments of those updates until you have tested them.
- Deploy to a small pilot group first, then print a representative complex document and confirm it comes out correctly.
- Check Microsoft's published guidance on the November 2026 updates before you decide anything, and check it again before you change course.
- Give the service desk a clear line for clients: what to report, what you already know and what happens next.
- Decide case by case whether to hold the update, apply it and work around the printing problem, or roll it back, and write down the reason.
- Keep a tested way to restore service if a change goes wrong, so a client's work is not blocked while you investigate.
- Do not stop patching in general because of a printing problem. Security updates close real holes, and skipping them exchanges a support issue for a security one.
How EnterProtect Helps
EnterProtect backup keeps clean, restorable copies of the systems and data your clients depend on.
EnterProtect recovery is built to get a client running again when something goes wrong, so a bad change does not have to become a long outage while you work out the cause.
EnterProtect vulnerability scanning gives you a standing view of which endpoints are behind on patching, so rollout decisions come from facts rather than guesswork.
Frequently Asked Questions
What Is Causing the Printing Problem After the November 2026 Updates?
Microsoft warned customers that the November 2026 security updates may break printing for documents with complex formatting, according to BleepingComputer. The report describes a side effect of the updates rather than an attacked flaw. No CVE is named.
Which Updates Are Involved?
The report names the November 2026 security updates for Windows. No specific update number or build is given beyond that. If you have already deployed them, treat a complex-document printing failure as a candidate cause until you rule it out.
What Counts as Complex Formatting?
The report does not define it. The practical answer for an MSP is to test with the documents your client actually prints, rather than assuming a simple test page will tell you anything. Ask the client which documents they cannot afford to lose.
Is This a Security Vulnerability?
The report describes a functional printing problem, not an exploited vulnerability or an attack. No CVE is named. That does not make it harmless: a client who cannot print may be unable to invoice, ship or serve customers, and that is a business outage.
Should I Remove the November 2026 Security Updates?
That is a decision for each client and each environment, and the report gives no recommendation either way. Removing security updates reopens whatever they fixed. In general, weigh the printing disruption against the risk of running unpatched, and look for a narrower fix before you remove anything.
How Should an MSP Handle a Bad Windows Update?
Stage it. Pilot the update on a small group, test the business processes that matter, then widen the rollout. Keep a rollback plan and a recent restore point before you start. If printing breaks after a broad push, you will be fixing it one client at a time.
Sources
- Microsoft says November security updates cause printing issues (Bleepingcomputer)