[悪用確認] CVE-2023-49105: ownCloud Improper Authentication Vulnerability

ownCloud ownCloud 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. 対応: 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. (期限 2026-08-30)

Read on CISA Known Exploited Vulnerabilities

On 08/27/2026, 09:00 AM, CISA Known Exploited Vulnerabilities published "[悪用確認] CVE-2023-49105: ownCloud Improper Authentication Vulnerability" (type: Advisory). Severity is "Critical" (critical). CVE: CVE-2023-49105.