What caused the Excel paste problem and which versions were affected?
A security update released on September 8, 2026, introduced a bug impacting the paste function in various standalone Excel versions including Excel 2016, 2019, 2021, 2024, and Excel Online via Office Online Server. This bug caused paste operations to fail silently—when users pasted content, nothing appeared in the destination and the source content stayed selected, without any error message or notification.
How has Microsoft responded and what fixes are available?
Microsoft quickly issued a hotfix specifically for Excel 2016 users, aiming to resolve this inconvenience ahead of the regular update schedule. Official fixes are also confirmed for Office LTSC 2021 and 2024 versions. However, for Office LTSC 2019 and Office 2016, only partial mitigations exist, meaning users may still encounter occasional paste issues despite the update.
Workaround to bypass the paste problem
In the meantime, the simplest workaround is to use the 'Paste Special' option found on the Home tab. This approach helps circumvent the bug, which has been linked to complications with conditional formatting during paste operations. Until full fixes roll out broadly, this method allows users to continue working with minimal disruption.
What does this mean for users of Microsoft 365 Excel editions?
Interestingly, the bug primarily affects non-365 versions of Excel and Office LTSC editions. Users on Microsoft 365 subscriptions appear less affected or not affected at all, likely due to more frequent updates and different build versions. This distinction highlights how update cadence and software versioning can influence bug prevalence and resolution speed.
Practical takeaways for Excel users
If you work with standalone versions of Excel from 2016 to 2024 or Office LTSC editions, be aware that pasting data may occasionally fail silently, especially when dealing with conditional formatting. Applying the 'Paste Special' option is a reliable temporary fix. For the best long-term solution, ensure your software is updated with the latest patches applicable to your version. Keep an eye on official update channels for the rollout of comprehensive fixes, particularly if you use Office LTSC 2019 or Excel 2016.
This situation underscores the importance of testing critical workflows following updates and having alternative methods at hand when core functionalities like copy-paste encounter problems.