What is CVE-2023-49105?
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.
Timeline
- 2023-11-21Published to the U.S. National Vulnerability Database (NVD)
- 2026-08-27Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
- 2026-08-28First covered in a defend.network daily briefing
- 2026-08-28NVD record last updated
- 2026-08-30CISA federal remediation deadline (BOD 22-01)
CISA Known Exploited Vulnerability
ownCloud Improper Authentication Vulnerability
Affected product
Owncloud Server
Remediation Steps
- Apply ownCloud security patch for CVE-2023-49105 immediately
- Review access logs for indicators of compromise targeting file repositories
- Restrict network access to ownCloud instances to trusted networks where possible
- Monitor for unauthorized file access or exfiltration activity
References
- https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/
- https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor
- https://owncloud.org/security
- https://nvd.nist.gov/vuln/detail/CVE-2023-49105
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 3 of September 2026 (September 21 – 27)
- Vulnerability Priority Report – Week 2 of September 2026 (September 14 – 20)
- Vulnerability Priority Report – Week 1 of September 2026 (September 7 – 13)
- Vulnerability Priority Report – Week 5 of August 2026 (August 31 – September 6)
- Vulnerability Priority Report – Week 4 of August 2026 (August 24 – 30)
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- PaperCut second patch; Cosmos EVM drained; McKesson 284M records stolen (2026-08-29)
- AI agents breach Hugging Face; Next.js, PaperCut RCEs exploited; TeamPCP arrests (2026-08-28)
Browse all tracked CVEs in the defend.network CVE database →
🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.