Filename Manipulation Vulnerability in Document Processing Software by Vendor
CVE-2026-77173

4.3MEDIUM

Key Information:

Vendor

Nextcloud
Status
Files Confidential
Vendor
CVE Published:
27 October 2026

What is CVE-2026-77173?

A vulnerability in the document processing software allows users to create files with '#' characters in their names. This configuration can lead to confidential information, such as credit card details, not being properly flagged as confidential, potentially exposing sensitive data to unauthorized access.

Affected Version(s)

Files Confidential 3.3.0 <= 5.0.0

References

https://hackerone.com/reports/3682163

CVSS V3.0

Score:
4.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

XavLimSG (xavlimsg)
.