Microsoft confirms Excel paste bug after update

Excel users who installed the September 2026 KB5002914 security update are discovering that copy and paste can fail without any warning, according to a Microsoft support document. The company has confirmed the issue and says it affects multiple versions of its spreadsheet software, leaving some users unable to paste content, autofill cells, or drag formulas.

Affected Office versions and user reports

Microsoft has confirmed that the problem affects Excel 2024, 2021, 2019, and 2016. The company's acknowledgement follows a wave of complaints on Reddit and the Microsoft Q&A forums, where users reported that the KB5002914 Office security update was disrupting basic Excel functions.

The update was released as part of Microsoft's September 2026 Patch Tuesday. According to the source, that update was intended to patch a long list of remote code execution and information disclosure vulnerabilities. The copy-and-paste failure appears to be an unintended side effect for some installations.

The silent failure of basic actions

What makes the issue particularly frustrating is that Excel provides no feedback when the problem occurs. Microsoft said in an updated support document that the source cell remains selected and the destination cell stays unmodified when a user attempts to paste.

"Although users try to paste content, the source remains selected and the destination is unmodified," Microsoft said. "When this issue occurs, users receive no indication of the failure, such as a beep or error message. Microsoft is researching the issue and will post more information in this article when the information becomes available."

— Microsoft, in an updated support document

The company said it is still investigating the root cause. No timeline for a permanent fix has been provided in the support document.

Uninstalling the update restores functionality

While Microsoft works on a resolution, affected users have reported that removing KB5002914 brings copy-and-paste back. To do that, users need to open a Command Prompt window with the "Run as administrator" option and run a command specific to their Office version.

For Office 2016, the command is:

"C:\Program Files\Common Files\Microsoft Shared\OFFICE16\Oarpmany.exe" /removereleaseinpatch "{90160000-0012-0000-1000-0000000FF1CE}" "{27882596-A8ED-4382-9C71-6CD2DD19F732}" "1033" "0"

For Office 2019, the command is:

"C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeC2RClient.exe" /update user updatetoversion=16.0.10417.20197

For Office 2021 and 2024, the command is:

"C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeC2RClient.exe" /update user updatetoversion=16.0.20326.20132

These steps are drawn from user reports and are not a permanent solution from Microsoft. They roll back the installed version of Office to an earlier build.

A pattern of post-update Office issues

This is not the first time this year that Microsoft updates have caused problems for Office users. In July, Microsoft fixed an issue that prevented third-party applications from launching Word, Excel, PowerPoint, Access, and other Microsoft Office apps or opening documents on up-to-date Windows systems.

One month earlier, Microsoft addressed another bug that blocked Office for the web users from opening Excel and PowerPoint files, and a separate issue that blocked Windows 365 users from downloading and installing the Office suite.

The source also notes that on Monday, Microsoft released emergency out-of-band updates to resolve Remote Desktop Services failures caused by the September 2026 security updates, along with Hyper-V and USB audio problems on some Windows versions.

What remains unclear about the fix

Microsoft has not said when a permanent patch for the Excel copy-and-paste bug will be available. The support document states that the company is researching the issue and will update the article when more information becomes available. In the meantime, users who rely on Excel for critical work may need to decide between keeping the security update installed and dealing with the broken functionality, or rolling back and losing the protections that KB5002914 provides.

The affected versions include some of the most widely deployed releases of Office. Excel 2016 and 2019 are still in use in many organizations, and the bug affects basic operations like copying data between cells, dragging formulas, and using autofill.

User frustration and the importance of feedback

The lack of any error message or warning makes the issue especially problematic. Users may attempt to paste content multiple times before realizing that nothing is happening, which can lead to wasted time and confusion. The fact that the problem was first reported by users on Reddit and the Microsoft Q&A forums highlights the role that community feedback plays in surfacing bugs that may not appear in internal testing.

Microsoft's confirmation of the issue came after those reports gained traction. The company's support document now serves as the central place for updates on the problem, though as of the source article, no fix had been deployed.

Implications for businesses and IT teams

For organizations that have already installed the September 2026 security updates, the Excel bug could disrupt everyday workflows. IT teams may face a choice between leaving systems exposed to the vulnerabilities that KB5002914 was meant to address, or uninstalling the update and accepting the loss of those protections. This trade-off is particularly acute for businesses that handle sensitive data and rely on Excel for reporting, financial modeling, or data entry.

The uninstall commands provided by users are not trivial to deploy across a large fleet of machines. They require administrator privileges and differ by Office version, which could complicate remediation for IT departments managing mixed environments. Until Microsoft releases a permanent fix, some organizations may need to document workarounds and communicate them to affected staff.

What to do if you're affected

If you're experiencing copy-and-paste failures in Excel after installing the September 2026 KB5002914 update, you can try the rollback commands listed above. Before doing so, consider the security implications of removing the update, as it was released to patch remote code execution and information disclosure vulnerabilities. If you're on a managed device, check with your IT department before making changes.

Microsoft is expected to update its support document with more information as it investigates. Users can also monitor the Microsoft Q&A forums for community-provided solutions or additional reports.