CVE-2023-49105 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 42.9% (pctl 99)
Patch first
On CISA KEV — known exploited in the wild, due 2026-08-30.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 42.92% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-287 |
| On CISA KEV | yes — remediate by 2026-08-30 |
| Public exploit | none known |
| Published | 2023-11-21 |
| Last modified | 2026-08-28 |
CISA KEV
| Name | ownCloud Improper Authentication Vulnerability |
|---|---|
| Added | 2026-08-27 |
| Due | 2026-08-30 |
| Vendor / product | ownCloud / ownCloud |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| 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
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105
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