Microsoft Office: September 8, 2026 Update causes (Excel) copy & paste issue

5 Responses to Microsoft Office: September 8, 2026 Update causes (Excel) copy & paste issue

1. Roli says:

   2026-09-10 at 16:52

   We were able to solve this by using this PowerShell script shown below. First, close all Office programs and pause Windows Updates. The latest versions in use at our place were Microsoft Excel 2016 (16.0.5569.1003) and MSO (16.0.5569.1003) 64-bit; afterward, it's 16.0.5569.1001, with the same MSO version.

   Save this script as uninstall_KB5002914.ps1 and run it with administrator privileges. A reboot was not required.

   $KB = 'KB5002914'
   function ConvertFrom-PackedMsiGuid {
   param([Parameter(Mandatory)][string]$Packed)

   if ($Packed.Length -ne 32) {
   throw "Invalid MSI-GUID: $Packed"
   }

   function Rev([string]$s) {
   -join [char[]]$s[$s.Length..0]
   }

   function Swap([string]$s) {
   $r = "
   for ($i = 0; $i -lt $s.Length; $i += 2) {
   $r += $s[$i + 1]
   $r += $s[$i]
   }
   $r
   }

   $a = -join $Packed.Substring(0,8).ToCharArray()[7..0]
   $b = -join $Packed.Substring(8,4).ToCharArray()[3..0]
   $c = -join $Packed.Substring(12,4).ToCharArray()[3..0]
   $d = Swap $Packed.Substring(16,4)
   $e = Swap $Packed.Substring(20,12)

   "{$a-$b-$c-$d-$e}"
   }

   $root = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products'

   $matches = foreach ($product in Get-ChildItem $root -ErrorAction Stop) {

   foreach ($patch in Get-ChildItem "$($product.PSPath)\Patches" -ErrorAction SilentlyContinue) {

   $info = Get-ItemProperty $patch.PSPath

   if ($info.DisplayName -like "*$KB*") {

   [pscustomobject]@{
   ProductGuid = ConvertFrom-PackedMsiGuid $product.PSChildName
   PatchGuid = ConvertFrom-PackedMsiGuid $patch.PSChildName
   DisplayName = $info.DisplayName
   Uninstallable = $info.Uninstallable
   }
   }
   }
   }

   if (-not $matches) {
   Write-Host "$KB was not found as an installed MSI patch."
   return
   }

   $matches | Format-List

   foreach ($m in $matches) {

   if ($m.Uninstallable -ne 1) {
   Write-Warning "$($m.DisplayName) According to Windows Installer, it cannot be uninstalled."
   continue
   }

   $log = "$env:TEMP\$KB-uninstall.log"

   $p = Start-Process `
   -FilePath "$env:WINDIR\System32\msiexec.exe" `
   -ArgumentList @(
   '/package', $m.ProductGuid,
   '/uninstall', $m.PatchGuid,
   '/passive',
   '/norestart',
   '/L*v', $log
   ) `
   -Wait `
   -PassThru

   Write-Host "ExitCode: $($p.ExitCode)"
   Write-Host "Log: $log"

   if ($p.ExitCode -eq 0) {
   Write-Host "$KB successfully uninstalled."
   }
   elseif ($p.ExitCode -eq 3010) {
   Write-Host "$KB successfully uninstalled. Windows restart required."
   }
   else {
   Write-Warning "Uninstallation Failed. MSI ExitCode $($p.ExitCode)"
   }
   }

   Reply
2. Tuffi says:

   2026-09-14 at 9:10

   Siehe hier:
   https://www.reddit.com/r/excel/comments/1wbs5x4/comment/p9pdekm/
   hat bei mir das Problem behoben

   Reply
   • guenni says:

     2026-09-14 at 15:53

     Won't fix for all affected users.

     Reply
3. Drac says:

   2026-09-15 at 0:31

   **Subject: Excel LTSC 2024 16.0.17932.20996 – Copy/Paste fails when copying FROM a worksheet containing Conditional Formatting**

   I found a reproducible Copy/Paste regression in Excel LTSC 2024 build 16.0.17932.20996.

   The important detail is that the problem is **specific to copying FROM a worksheet that contains Conditional Formatting**. It does not affect the whole workbook.

   ### Minimal reproduction
   1. Create a new blank workbook.
   2. Create two worksheets:

   * Sheet1: no Conditional Formatting.
   * Sheet2: add a simple Conditional Formatting rule to one cell.
   3. Enter `hello` in a cell on Sheet1.
   4. Copy Sheet1 → Sheet2: **works correctly**.
   5. Enter `hello` in a cell on Sheet2.
   6. Copy Sheet2 → Sheet1: **Copy/Paste silently fails**.
   7. The same failure occurs when copying a newly created cell containing only plain text; it is not related to formulas or the cell contents.

   I also reproduced the problem in an existing, long-standing `.xlsm` workbook. A worksheet containing Conditional Formatting could not be copied from normally, even when the source cell contained only simple text.

   Interestingly:
   * Copying **Values** from the affected worksheet works.
   * Copying **Formulas** works.
   * Copying **Formats** fails.
   * Normal Copy/Paste fails.
   * Copying from a worksheet without Conditional Formatting into the affected worksheet works.

   ### Workaround / confirmation
   I rolled back Office LTSC 2024 from:

   **16.0.17932.20996 → 16.0.17932.20910**

   using Click-to-Run.
   "C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeC2RClient.exe" /update user updatetoversion=16.0.17932.20910

   After the rollback, both:
   * the minimal test workbook, including Copy/Paste after adding Conditional Formatting, and
   * the original affected workbook
   work correctly again.

   Environment:
   * Windows 11 Pro 25H2
   * Microsoft Office LTSC Standard 2024
   * Version 2408
   * Affected build: 16.0.17932.20996
   * Working build: 16.0.17932.20910

   Reply
4. Drac says:

   2026-09-15 at 0:32

   **Subject: Excel LTSC 2024 16.0.17932.20996 – Copy/Paste fails when copying FROM a worksheet containing Conditional Formatting**

   I found a reproducible Copy/Paste regression in Excel LTSC 2024 build 16.0.17932.20996.

   The important detail is that the problem is **specific to copying FROM a worksheet that contains Conditional Formatting**. It does not affect the whole workbook.

   ### Minimal reproduction
   1. Create a new blank workbook.
   2. Create two worksheets:

   * Sheet1: no Conditional Formatting.
   * Sheet2: add a simple Conditional Formatting rule to one cell.
   3. Enter `hello` in a cell on Sheet1.
   4. Copy Sheet1 → Sheet2: **works correctly**.
   5. Enter `hello` in a cell on Sheet2.
   6. Copy Sheet2 → Sheet1: **Copy/Paste silently fails**.
   7. The same failure occurs when copying a newly created cell containing only plain text; it is not related to formulas or the cell contents.

   I also reproduced the problem in an existing, long-standing `.xlsm` workbook. A worksheet containing Conditional Formatting could not be copied from normally, even when the source cell contained only simple text.

   Interestingly:
   * Copying **Values** from the affected worksheet works.
   * Copying **Formulas** works.
   * Copying **Formats** fails.
   * Normal Copy/Paste fails.
   * Copying from a worksheet without Conditional Formatting into the affected worksheet works.

   ### Workaround / confirmation
   I rolled back Office LTSC 2024 from:

   **16.0.17932.20996 → 16.0.17932.20910**

   using Click-to-Run.
   "C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeC2RClient.exe" /update user updatetoversion=16.0.17932.20910

   After the rollback, both:
   * the minimal test workbook, including Copy/Paste after adding Conditional Formatting, and
   * the original affected workbook
   work correctly again.

   Environment:
   * Windows 11 Pro 25H2
   * Microsoft Office LTSC Standard 2024
   * Version 2408
   * Affected build: 16.0.17932.20996
   * Working build: 16.0.17932.20910

   Reply