CVE-2023-49105: ownCloud Improper Authentication Vulnerability
Summary
ownCloud has an improper authentication vulnerability (CVE-2023-49105) that allows unauthenticated attackers to access, modify, or delete files if the victim's username is known and they lack a signing key. Organizations must apply vendor-provided mitigations and comply with CISA's BOD 26-04 guidance for prioritizing security updates.
IFF Assessment
This vulnerability allows unauthorized file access and modification, posing a significant risk to data confidentiality and integrity for defenders.
Severity
CISA KEV: Listed as actively exploited. Federal patch due: August 30, 2026. Known ransomware use: Unknown.
Defender Context
This vulnerability in ownCloud presents a critical risk for organizations using the software, as it allows for unauthorized file manipulation. Defenders should prioritize applying patches or mitigations as per vendor instructions and CISA guidance to prevent potential data breaches or ransomware attacks leveraging this flaw.