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TechQuiet 3d · day 6

Microsoft fixes Excel copy-paste bug from September security update

KB5002665 patch resolves silent failures in Excel 2016 MSI; workaround available for other versions.

newest coverage 2d agosummary written 2d ago6 pieces8 likes & upvotes MastodonNewswires

What to know

  • September 2026 KB5002914 security update introduced a code regression breaking silent copy-and-paste in Excel 2016, 2019, 2021, 2024, and Excel Online.
  • KB5002665 fix released for MSI-based Excel 2016 only; Click-to-Run and later versions remain unfixed pending permanent solutions.
  • Users can work around the issue using Paste Special or uninstall KB5002914, though the latter removes critical security patches for RCE and disclosure vulnerabilities.

Microsoft Software vendor

Microsoft fixes Excel copy-paste bug from September security update
Ghacks

How it unfolded 2 developments, newest first · click a bar or a number to jump articlesposts

Peak 2 pieces in two hours at Sep 18, 2 AM; 6 pieces over 6 days (2 articles · 4 posts) Sep 18, 2 AM — 2 pieces · 2 posts — Mastodon 2Sep 18, 4 AM — quietSep 18, 6 AM — quietSep 18, 8 AM — quietSep 18, 10 AM — quietSep 18, 12 PM — quietSep 18, 2 PM — quietSep 18, 4 PM — quietSep 18, 6 PM — quietSep 18, 8 PM — quietSep 18, 10 PM — quietSep 19, 12 AM — quietSep 19, 2 AM — quietSep 19, 4 AM — quietSep 19, 6 AM — quietSep 19, 8 AM — quietSep 19, 10 AM — quietSep 19, 12 PM — quietSep 19, 2 PM — quietSep 19, 4 PM — quietSep 19, 6 PM — quietSep 19, 8 PM — quietSep 19, 10 PM — quietSep 20, 12 AM — quietSep 20, 2 AM — quietSep 20, 4 AM — quietSep 20, 6 AM — quietSep 20, 8 AM — quietSep 20, 10 AM — quietSep 20, 12 PM — quietSep 20, 2 PM — quietSep 20, 4 PM — quietSep 20, 6 PM — quietSep 20, 8 PM — quietSep 20, 10 PM — quietSep 21, 12 AM — quietSep 21, 2 AM — quietSep 21, 4 AM — quietSep 21, 6 AM — quietSep 21, 8 AM — 2 pieces · 1 article · 1 post — Mastodon 2Sep 21, 10 AM — 2 pieces · 1 article · 1 post — Mastodon 1, Newswires 1Sep 21, 12 PM — quietSep 21, 2 PM — quietSep 21, 4 PM — quietSep 21, 6 PM — quietSep 21, 8 PM — quietSep 21, 10 PM — quietSep 22, 12 AM — quietSep 22, 2 AM — quietSep 22, 4 AM — quietSep 22, 6 AM — quietSep 22, 8 AM — quietSep 22, 10 AM — quietSep 22, 12 PM — quietSep 22, 2 PM — quietSep 22, 4 PM — quietSep 22, 6 PM — quietSep 22, 8 PM — quietSep 22, 10 PM — quietYesterday, 12 AM — quietYesterday, 2 AM — quietYesterday, 4 AM — quietYesterday, 6 AM — quietYesterday, 8 AM — quietYesterday, 10 AM — quietYesterday, 12 PM — quietYesterday, 2 PM — quietYesterday, 4 PM — quietYesterday, 6 PM — quietYesterday, 8 PM — quietYesterday, 10 PM — quietToday, 12 AM — quietToday, 2 AM — quiet 12
Sep 19Sep 20Sep 21Sep 22yesterdaynow · 4:44 AM ET
  1. 2

    Interim workarounds confirmed; September 12 updates may fix some versions

    Microsoft recommends Paste Special as a temporary workaround for affected users. Users report that September 12 updates for Office 2019, 2021, and 2024 appear to resolve the issue, though Microsoft has not officially confirmed this. Uninstalling KB5002914 restores functionality but removes critical security patches for remote code execution and information disclosure vulnerabilities.

    “Even when users attempt to paste content, the original source stays selected and the destination is not changed. In this situation, users get no sign that the operation has failed, for example no beep or error message.”
    — Microsoft, Software vendor · source
    1. 2 outlets Microsoft fixes broken Excel copy and paste for all Office users

      first by Mastodon, 2d ago · also Ghacks

      1 more headline
    • BleepingComputer@infosec.exchange

      Microsoft has fixed a known issue that causes copy-and-paste failures for Excel users after installing the September 2026 security updates. https://www. bleepingcomputer.com/news/micr osoft/microsoft-fixes-broken-excel-copy-and-paste-for-all-office-users/

      BleepingComputer@infosec.exchangeMastodon2d agoview on Mastodon ↗
  2. background

    Microsoft releases KB5002665 fix for Excel 2016 MSI users — KB5002665 is released to correct the copy-and-paste failures in MSI-based Excel 2016 only. The fix does not extend to Click-to-Run versions of Office 2016 (including Office 365 Home) or to Excel 2019, 2021, 2024, or Excel Online.

  3. 2 days quiet
  4. 1

    Microsoft confirms KB5002914 regression, attributes to code defect

    Microsoft officially acknowledges the paste failures and attributes the problem to a code regression in the September update.

    • BleepingComputer@infosec.exchange

      Microsoft has fixed a known issue that causes copy-and-paste failures for some Excel users after installing the September 2026 KB5002914 security update. https://www. bleepingcomputer.com/news/micr osoft/microsoft-fixes-broken-copy-and-paste-for-excel-2016-users/

      BleepingComputer@infosec.exchangeMastodon6d agoview on Mastodon ↗
  5. background

    Microsoft releases September security updates causing Excel paste failures — KB5002914 security update is deployed, introducing a code regression that breaks copy-and-paste operations across Excel 2016, 2019, 2021, 2024, and Excel Online. Operations fail silently with no error message or beep to alert users.

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