ownCloud Improper Authentication
What to do
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.
CISA deadline 2026-08-30 · passed 11 days ago · applies to US federal civilian agencies; used elsewhere as a reference SLA
What happened
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.
Who is affected
ownCloud ownCloud. Affected version ranges are listed in the vendor advisory and the NVD entry linked under Sources.
Weakness class: CWE-287.
Timeline
- Added to CISA KEVExploitation in the wild confirmed by CISA
- CISA remediation deadlinepassed 11 days ago
Sources
- NVD entry for CVE-2023-49105 nvd.nist.gov/vuln/detail/CVE-2023-49105
- CISA Known Exploited Vulnerabilities catalog www.cisa.gov/known-exploited-vulnerabilities-catalog
- owncloud.org owncloud.org/security
- owncloud.com owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/
- cisa.gov www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- cisa.gov www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- nvd.nist.gov nvd.nist.gov/vuln/detail/CVE-2023-49105