Windows Paint: how to verify the Microsoft Store update
A workstation can be current in Windows Update and still have an older copy of Paint. CVE-2026-83844 provides a concrete way to test how your fleet verifies app fixes.
Ler em portuguêsBy Pentesty
Set the acceptance criterion before measuring coverage
The November 6 report concerns availability of the fix for a vulnerability Microsoft disclosed on October 13, 2026. Microsoft rates the out-of-bounds read as Important and assigns it a CVSS score of 8.1. The advisory describes potential code execution from a specially crafted packet sent to an affected service. It does not name the service or specify a port.
As checked on November 6, the technical advisory identified 11.2609.401.0 as the fixed build, while Microsoft's published CVE record marked versions from 11.0.0.0 up to, but excluding, 11.2605.91.0 as affected. Use the advisory build as a conservative threshold for accepting the rollout. If a scanner clears an intermediate version, document the discrepancy and ask the vendor for confirmation before closing the finding. Keep dated copies of both references so the rule can be revisited if they change.
Track installed and provisioned packages separately
Start with the managed Windows workstation inventory. Identify the Paint package, version and context in which it appears. Use Get-AppxPackage -AllUsers -Name Microsoft.Paint with administrator permissions to examine installed package records. Run a separate Get-AppxProvisionedPackage -Online query against the running image to see what is provisioned for new users. A version gathered from a single profile can miss older registrations.
Test collection across representative endpoints, including a shared workstation and an image used to prepare new devices if those exist in your environment. For a mounted image, specify its location with -Path. Verify package identity so a similarly named app cannot skew the results. Mark offline devices and unsuccessful queries as awaiting evidence. Your team should be able to distinguish a confirmed absence from an incomplete inventory.
Test Store delivery in each policy group
The advisory identifies the update as a Microsoft Store package. A compliant Windows Update report alone cannot establish the app version. Microsoft's Intune documentation distinguishes the policy that blocks the Store interface from the policy that turns off automatic app updates. Check access to update content and the installation context before changing policy across a fleet.
On November 6, the US Store catalog offered the build listed in the advisory. That observation establishes availability in that catalog. During the pilot, compare it with the package each workstation actually received. If a device shows two versions, identify the profiles associated with each one and repeat the inventory after delivery.
Pilot the update in each representative group. Use the company's approved managed channel, repeat both queries and confirm the result by signing in with a test profile where provisioning applies. If a set of devices cannot reach the channel, open an exception with an owner and a deadline. Any decision to remove the app needs its own test, operational approval and verification of both installation and provisioning.
Close the ticket with device-level evidence
Attach the device identifier, collection date, package source, observed versions, policy group and follow-up result. Separate devices that meet the acceptance criterion from those still offline or reporting conflicting versions. Report coverage against all devices in scope and keep unanswered cases visible. The same distinction between a delivered package and a verified component is useful in Linux kernel update acceptance.
Frequently asked questions
Can I use Windows Update status as evidence?
Use it to track operating system updates. For Paint, collect the installed package identity and version, and examine provisioning where applicable.
What if the scanner clears an intermediate version?
Keep the output, compare its rule with Microsoft's advisory and leave the finding open until you can demonstrate the fixed build or get applicable vendor confirmation.
Does blocking the Store interface prevent the fix?
That depends on effective policies and connectivity. Microsoft documents Store interface access and automatic app updates as separate settings.
How should I handle a workstation that did not report?
Record its last check, assign an owner and schedule another query. Until you have evidence, leave that device out of the verified remediation count.
Sources and references
- Cyber Security Brazil: editorial news reference
- Microsoft Security Response Center, CVE-2026-83844
- Microsoft, October 2026 machine-readable advisory
- CVE Program, record published by Microsoft
- Microsoft Store, official Paint listing
- Microsoft Learn, Store app policy and deployment
- Microsoft Learn, inventory of installed packages by user
- Microsoft Learn, inventory of provisioned packages
Original Pentesty analysis, published November 6, 2026. The proposed scenarios are editorial guidance, with scope and validation to be defined for each environment.