CVE-2023-49105
An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify,...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2023-49105- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N - Weakness
- CWE-287
- Updated
- 2026-11-02
EUVDEUVD-2023-53114
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.
- Record
EUVD-2023-53114- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-585g-f852-v6p4
An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify,...
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.
- Record
GHSA-585g-f852-v6p4- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-287
- Updated
- 2026-11-02
CISA KEV No score
ownCloud Improper Authentication Vulnerability
ownCloud contains an improper authentication vulnerability that allows an attacker to access, modify, or delete any file without authentication if the username of a victim is known, and the victim has no signing-key configured.
- Record
CVE-2023-49105- Weakness
- CWE-287
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2023-49105- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-287
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2023-49105- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N - Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | ambionics/owncloud-exploits | 2023-12-05 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation | ||
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-49105 is a critical vulnerability (CVSS 9.8) in Owncloud, published November 21, 2023. CISA lists it as known to be exploited, since August 27, 2026. EUVD reports exploitation since August 27, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 43.2%, the 98th percentile. No source names a fixed version.
References
owncloud.org/security
owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls
hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105
nvd.nist.gov/vuln/detail/CVE-2023-49105
github.com/advisories/GHSA-585g-f852-v6p4