CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2023-49105
Critical (9.8) in ownCloud ownCloud. In CISA KEV since 2026-08-27. EPSS 43% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 43% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-31)
- CISA KEV
- listed 2026-08-27, due 2026-08-30
- CWE
- CWE-287
- Published
- Modified
- Record from
- the NVD, synced
Affected
- owncloud:owncloud_server
References
- https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/
- https://owncloud.org/security
- https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/
- https://owncloud.org/security
- https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor