CVE-2026-77173

Files with # in name not flagged as confidential in Nextcloud

Published Oct 27, 2026 CVSS 3.0 · 4.3 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Workaround

Change config setting: Add # to forbidden_filename_characters and rename all affected files

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Nextcloud
Nextcloud files Confidential
Vendors & Products Nextcloud
Nextcloud files Confidential
Type Values Removed Values Added
Title Files with # in name not flagged as confidential in Nextcloud
Type Values Removed Values Added
Description 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.
Weaknesses CWE-284
References
Metrics cvssV3_0

{'score': 4.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
hackerone
Published
Updated
Nov 4, 2026, 8:25 PM
Reserved
Aug 20, 2026, 3:00 PM
Status
Awaiting Analysis
Published
Oct 27, 2026, 5:17 PM
Modified
Nov 4, 2026, 9:18 PM