Is CVE-2016-9463 in the CISA KEV catalog?

No. CVE-2016-9463 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-9463?

CVE-2016-9463 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2016-9463?

CVE-2016-9463 has an EPSS score of 4.09% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-9463?

Upgrade nextcloud server to 10.0.1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2016-9463

HIGHEPSS 89th pctl

8.1

CVSS v3

NVD

Description

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.

CWE-303 CWE-287Improper Authentication

How to fix

Remediation Available

nextcloud serverNVD

Affected:>= 10.0.0, < 10.0.1Fixed in:10.0.1CVE-2016-9463derived from NVD

owncloudNVD

Affected:>= 9.1.0, < 9.1.2Fixed in:9.1.2CVE-2016-9463derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

4.09%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Patch7

Exploit2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.