{"id":"CVE-2023-49105","aliases":["EUVD-2023-53114","GHSA-585g-f852-v6p4"],"status":"published","title":"An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify,...","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.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.4319,"percentile":0.98741,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-287"],"published":"2023-11-21T00:00:00Z","modified":"2026-10-28T02:30:21Z","kev":{"date_added":"2026-08-27","due_date":"2026-08-30","required_action":"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.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2026-08-27"},{"source":"kev","since":"2026-08-27"}],"exploits":[{"source":"pocgithub","id":"ambionics/owncloud-exploits","title":"ambionics/owncloud-exploits","date":"2023-12-05","url":"https://github.com/ambionics/owncloud-exploits"}],"products":[{"vendor":"owncloud","product":"owncloud"},{"vendor":"owncloud","product":"owncloud_server"}],"references":[{"url":"https://owncloud.org/security","tags":["x_transferred","Product","web"]},{"url":"https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/","tags":["x_transferred","Vendor Advisory","advisory"]},{"url":"https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor","tags":["third-party-advisory","Third Party Advisory","advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105","tags":["government-resource","US Government Resource","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-49105","tags":["advisory"]},{"url":"https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls"},{"url":"https://github.com/advisories/GHSA-585g-f852-v6p4"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/49xxx/CVE-2023-49105.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2023-49105","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.","status":"published","published":"2023-11-21T00:00:00Z","modified":"2026-08-28T03:55:23.877Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N","level":"critical","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:35:12.998024Z"}],"euvd":[{"id":"EUVD-2023-53114","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.","status":"published","published":"2023-11-21T00:00:00Z","modified":"2026-08-28T03:55:23Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N","level":"critical"}],"exploited_since":"2026-08-27","updated_at":"2026-11-02T18:01:24.093932Z"}],"ghsa":[{"id":"GHSA-585g-f852-v6p4","title":"An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify,...","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.","status":"published","published":"2023-11-22T00:30:21Z","modified":"2026-08-27T21:32:08Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T15:11:05.645531Z"}],"kev":[{"id":"CVE-2023-49105","title":"ownCloud Improper Authentication Vulnerability","description":"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.","cwes":["CWE-287"],"kev":{"date_added":"2026-08-27","due_date":"2026-08-30","required_action":"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.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"CVE-2023-49105","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.","status":"published","published":"2023-11-21T22:15:08.613Z","modified":"2026-08-28T12:21:09.753Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:08:47.966245Z"}],"osv":[{"id":"CVE-2023-49105","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.","status":"published","published":"2023-11-21T00:00:00Z","modified":"2026-10-28T02:30:21.058904509Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N","level":"critical"}],"updated_at":"2026-11-02T15:44:34.72355Z"}]}}