A user could create a docx or odt file with a # in the filename with confidential information such as a credit card number and have it not be marked as confidential.

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-77173 · Microsoft / collected KEV context

cve-program · CVE-2026-77173

• https://hackerone.com/reports/3682163

• A user could create a docx or odt file with a # in the filename with confidential information such as a credit card number and have it not be marked as confidential. · Newly collected advisory · 27 Oct 2026