CVE-2023-49105ownCloud Improper Authentication Vulnerability
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.
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.8 | CRITICAL | 3.1mitre (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 9.8 | CRITICAL | 3.1mitre (CNA) | CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N |
CISA required action
⚡ Known exploited · remediation due Aug 30, 2026
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Details
- CVE ID
- CVE-2023-49105
- Status
- Analyzed
- Assigner (CNA)
- mitre
- Published
- Nov 21, 2023
- Last modified
- 2026-08-28 12:21 UTC
- Weaknesses
Affected Products
From NVD CPE configurations.
owncloudowncloud server1 version range
- 10.6.0 before 10.13.1
References
- owncloud.com https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/
- owncloud.org https://owncloud.org/security
- hunt.io https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105