---
id: CVE-2023-49105
title: An issue was discovered in ownCloud owncloud/core before 10.13.1
summary: >-
  An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker
  can access, modify, or delete any file without authentication if the username
  of a victim is known, and the victim has no signing-key configured. This
  occurs b…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-287
  - CWE-287
vendor: owncloud
product: owncloud_server
affected:
  - 'owncloud_server >= 10.6.0, < 10.13.1'
patched:
  - owncloud_server 10.13.1
published: '2023-11-21'
updated: '2026-08-27'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-49105'
references:
  - url: >-
      https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/
    label: cve@mitre.org
  - url: 'https://owncloud.org/security'
    label: cve@mitre.org
  - url: >-
      https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://owncloud.org/security'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
epss: 0.42919
epssPercentile: 0.98674
kev: true
kevDateAdded: '2026-08-27'
kevDueDate: '2026-08-30'
kevRansomware: false
exploited: true
ingestedAt: '2026-08-27T21:08:14.141Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/ambionics/owncloud-exploits'
  checkedAt: '2026-09-26T09:05:30.172Z'
exploitAvailable: true
---

## Overview

An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify, or delete any file without authentication if the username of a victim is known, and the victim has no signing-key configured. This occurs because pre-signed URLs can be accepted even when no signing-key is configured for the owner of the files. The earliest affected version is 10.6.0.

## Affected

- `owncloud_server >= 10.6.0, < 10.13.1`

## Remediation

Upgrade past the affected range:

- `owncloud_server 10.13.1`