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CVE-2016-9463

22
FAUCET Score

CVE-2016-9463 describes an SMB user authentication bypass vulnerability affecting Nextcloud Server before 9.0.54 and 10.0.1, and ownCloud Server before 9.1.2, 9.0.6, and 8.2.9. This flaw, present in the optional SMB authentication component, allows an unauthenticated attacker to gain access to accounts without valid credentials if the SMB server has anonymous authentication configured. Rated with a CVSS score of 8.1 (HIGH), the vulnerability has a network attack vector, high attack complexity, and can lead to high impact on confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage for this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 9.0.54CPE matchmatch criteria
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
>= 10.0.0, < 10.0.1CPE matchmatch criteria
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
>= 8.2.0, < 8.2.9CPE matchmatch criteria
cpe:2.3:a:owncloud:owncloud:*:*:*:*:*:*:*:*
>= 9.0.0, < 9.0.4CPE matchmatch criteria
cpe:2.3:a:owncloud:owncloud:*:*:*:*:*:*:*:*
>= 9.1.0, < 9.1.2CPE matchmatch criteria
cpe:2.3:a:owncloud:owncloud:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.09%
Probability of exploitation in next 30 days
EPSS Percentile
89.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0410 is in the 53rd percentile among its peer group of 8,914 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274
Issue TrackingPatchThird Party Advisory
github.com / nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087
Issue TrackingPatchThird Party Advisory
github.com / owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791
Issue TrackingPatchThird Party Advisory
github.com / owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732
Issue TrackingPatchThird Party Advisory
github.com / owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3
Issue TrackingPatchThird Party Advisory
hackerone.com / reports/148151
ExploitThird Party Advisory
nextcloud.com / security/advisory
PatchVendor Advisory
owncloud.org / security/advisory
PatchVendor Advisory
rhinosecuritylabs.com / 2016/10/operation-ownedcloud-exploitation-post-exploitation-persistence
ExploitTechnical DescriptionThird Party Advisory