CVE-2016-9463

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4.1%CVSS: 8.1Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

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.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
43
EG Risk 43/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation4% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
4.1%
EPSS %ILE
90th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

March 28, 2017

Last Modified

June 17, 2026

Advisory Details (8)

Auto-updated Sep 19, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit b85ace6840b8 (nextcloud/apps)

Fix landed in nextcloud/apps commit b85ace6840b8 — awaiting tagged release

https://github.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274
generic🟡 PoC Available

Operation OwnedCloud: Exploitation and Post-exploitation Persistence - Rhino Security Labs

https://rhinosecuritylabs.com/2016/10/operation-ownedcloud-exploitation-post-exploitation-persistence/
generic

Security in Nextcloud

https://nextcloud.com/security/advisory/?id=nc-sa-2016-006
generic

HackerOne

https://hackerone.com/reports/148151
github_commit

commit a0e07b7ddd5a (owncloud/apps)

Fix landed in owncloud/apps commit a0e07b7ddd5a — awaiting tagged release

https://github.com/owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3
github_commit

commit 5d47e7b52646 (owncloud/apps)

Fix landed in owncloud/apps commit 5d47e7b52646 — awaiting tagged release

https://github.com/owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732
github_commit

commit 16cbccfc946c (owncloud/apps)

Fix landed in owncloud/apps commit 16cbccfc946c — awaiting tagged release

https://github.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791
github_commit

commit decb91fd31f4 (nextcloud/apps)

Fix landed in nextcloud/apps commit decb91fd31f4 — awaiting tagged release

https://github.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 23× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 152 total refreshes for this CVE.

  1. 2026-10-05 17:38 UTCEPSS rescore
  2. 2026-10-03 14:21 UTCEPSS rescore
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  4. 2026-09-30 14:58 UTCEPSS rescore
  5. 2026-09-30 09:18 UTCEG score recompute
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  1. 2026-09-01 13:48 UTCEPSS rescore
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  3. 2026-08-30 16:51 UTCOSV refresh
  4. 2026-08-28 21:35 UTCEPSS rescore
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  28. 2026-07-29 09:04 UTCOSV refresh
  29. 2026-07-28 15:31 UTCEPSS rescore
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  34. 2026-07-23 01:24 UTCEG score recompute
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  36. 2026-07-22 14:04 UTCEPSS rescore
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  52. 2026-07-12 05:43 UTCEPSS rescore
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  54. 2026-07-12 01:41 UTCOSV refresh
  55. 2026-07-11 08:24 UTCEPSS rescore
  56. 2026-07-09 19:06 UTCEPSS rescore
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  73. 2026-06-23 21:30 UTCEPSS rescore
  74. 2026-06-23 08:00 UTCOSV refresh
  75. 2026-06-22 14:23 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2016-9463?
CVE-2016-9463 is a high vulnerability published on March 28, 2017. 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…
When was CVE-2016-9463 disclosed?
CVE-2016-9463 was first published on March 28, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-9463 actively exploited?
CVE-2016-9463 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.1% probability of exploitation in the next 30 days (90th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2016-9463?
CVE-2016-9463 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2016-9463?
An upstream fix for CVE-2016-9463 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix.

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