CVE-2023-49105
Modified
Published: 21 Nov 2023, 00:00
Last modified:27 Aug 2026, 19:58
Vulnerability Summary
Overall Risk (default)
high
70/100 CVSS Score
9.8 CRITICAL
v3.1 (cve.org)
EPSS Score
11.07% MEDIUM
11% probability -78.53%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected
Timeline
21 Nov 2023, 00:00
Published
Vulnerability first disclosed
27 Aug 2026, 00:00
Added to CISA KEV
ownCloud Improper Authentication Vulnerability
27 Aug 2026, 19:58
Last Modified
Vulnerability information updated
30 Aug 2026, 00:00
CISA Remediation Due
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.
Description
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.
CVSS Metrics
- v3.1•CRITICAL•Score: 9.8CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N
- v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Trends
Current EPSS score: 11.07%• Percentile: 96%
Techniques & Countermeasures
- CWE-287•Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Affected Systems
- owncloud•owncloud_server
≥ 10.6.0, < 10.13.1