CVE-2026-77173 | BDVDB-2026-396240 Detail

NextcloudFiles Confidential

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.

Impact#

Per CVSS v3.0: confidentiality impact low, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

CWE-284 Improper Access Control

References#

https://hackerone.com/reports/3682163

Exploit#

No public exploit known

History#

Version 12026-10-27Record published in the CVE List.
Version 22026-11-04Most recent update recorded in the CVE List.

Published

Published: 2026-10-27
Last modified: 2026-11-04

Vendor information

Vendor: Nextcloud
Product: Files Confidential

All Nextcloud vulnerabilities

Score

4.3 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 11.6.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Improper Access Control

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 3.3.0 and <= 5.0.0
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

Not available

CVSS v3.0

4.3 Medium

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity	None
Availability	None

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).