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TI-2016-07734 Aliases CVE-2016-9463GHSA-4r4x-7f2r-2f4c

Improper authentication in Nextcloud Server & ownCloud Server Nextcloud Server before…

Priority MEDIUM 42CWE-303Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-287.

Summary

Nextcloud Server before 9.0.54 and 10.0.1 & ownCloud Server before 9.1.2, 9.0.6, and 8.2.9 suffer from SMB User Authentication Bypass. Nextcloud/ownCloud include an optional and not by default enabled SMB authentication component that allows authenticating users against an SMB server. This backend is implemented in a way that tries to connect to a SMB server and if that succeeded consider the user logged-in. The backend did not properly take into account SMB servers that have any kind of anonymous auth configured. This is the default on SMB servers nowadays and allows an unauthenticated attacker to gain access to an account without valid credentials. Note: The SMB backend is disabled by default and requires manual configuration in the Nextcloud/ownCloud config file. If you have not configured the SMB backend then you're not affected by this vulnerability.

Why it matters now

EPSS 0.04095 90th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—Nextcloud Server & ownCloud Server Nextcloud Server before 9.0.54 and 10.0.1 & ownCloud Server before 9.1.2, 9.0.6, and 8.2.9Nextcloud Server & ownCloud Server Nextcloud Server before 9.0.54 and 10.0.1 & ownCloud Server before 9.1.2, 9.0.6, and 8.2.9—No fix listedCNA
  • Nextcloud Server & ownCloud Server Nextcloud Server before 9.0.54 and 10.0.1 & ownCloud Server before 9.1.2, 9.0.6, and 8.2.9 Vendor— Affected Nextcloud Server & ownCloud Server Nextcloud Server before 9.0.54 and 10.0.1 & ownCloud Server before 9.1.2, 9.0.6, and 8.2.9 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*before 9.0.54; 10.0.0 to before 10.0.1Vulnerablenextcloud
cpe:2.3:a:owncloud:owncloud:*:*:*:*:*:*:*:*8.2.0 to before 8.2.9; 9.0.0 to before 9.0.4; 9.1.0 to before 9.1.2VulnerableownCloud
  • cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* Versions before 9.0.54; 10.0.0 to before 10.0.1 Vulnerable ·nextcloud
  • cpe:2.3:a:owncloud:owncloud:*:*:*:*:*:*:*:* Versions 8.2.0 to before 8.2.9; 9.0.0 to before 9.0.4; 9.1.0 to before 9.1.2 Vulnerable ·ownCloud

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2016-9463
  2. 2026-10-03 Alias added: GHSA-4r4x-7f2r-2f4c

References

Exploit 2

Patch 7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences