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.

No CVSS v4.0

No CVSS v3.1

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00207.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Nextcloud Files Confidential unaffected
Version Status Constraints
3.3.0 affected ≤ 5.0.0

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Nextcloud Subscribe
Files Confidential Subscribe

Project Subscriptions

Vendors Products
Nextcloud Subscribe
Files Confidential Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

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

References
Link Providers
https://hackerone.com/reports/3682163 cve-icon cve-icon
History

Wed, 28 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
First Time appeared Nextcloud
Nextcloud files Confidential
Vendors & Products Nextcloud
Nextcloud files Confidential

Tue, 27 Oct 2026 18:00:00 +0000

Type Values Removed Values Added
Title Files with # in name not flagged as confidential in Nextcloud

Tue, 27 Oct 2026 16:30:00 +0000

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2026-10-27T16:15:34.777Z

Reserved: 2026-08-20T15:00:00.607Z

Link: CVE-2026-77173

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-27T17:17:03.053

Modified: 2026-10-28T14:47:07.963

Link: CVE-2026-77173

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-28T22:12:31Z

Weaknesses