Microsoft Confirms New Outlook Bug Blocking Excel Attachments
ID: e3811645-eceb-5ed9-b453-0cf186e5c1eb
STIX ID: report--e3811645-eceb-5ed9-b453-0cf186e5c1eb
Feed Name: cybersecurityNews.com
Microsoft acknowledged a bug in the new Outlook for Windows causing Excel attachments with non-ASCII filenames to fail to open (EX1189359) due to a filename encoding error; a fix has been developed and is in validation, with workarounds to use Outlook on the Web or download the file locally, and further status updates expected on December 1, 2025.
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