cve-2023-49105

{
  "cvss": 9.8,
  "datePublished": "2026-08-27",
  "dateUpdated": "2026-08-27",
  "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.",
  "dueDate": "2026-08-30",
  "id": "CVE-2023-49105",
  "kev_catalogs": [
    "cisa"
  ],
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "https://owncloud.org/security ; https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2023-49105",
  "product": "ownCloud",
  "requiredAction": "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.",
  "severity": "CRITICAL",
  "source": "cisa_known_exploited",
  "title": "ownCloud Improper Authentication Vulnerability",
  "vendor": "ownCloud"
}