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 a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 8.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
8.1(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
90%
KEV
Not listed

Published

March 28, 2017

Last Modified

June 17, 2026

References (18)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 40× 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.

  1. 2026-07-28 15:31 UTCEPSS rescore
  2. 2026-07-26 14:50 UTCEPSS rescore
  3. 2026-07-25 14:13 UTCEPSS rescore
  4. 2026-07-24 14:13 UTCEPSS rescore
  5. 2026-07-23 14:15 UTCEPSS rescore
  6. 2026-07-23 01:24 UTCEG score recompute
  7. 2026-07-22 22:04 UTCEG score recompute
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  20. 2026-07-15 16:54 UTCEPSS rescore
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  1. 2026-07-12 01:41 UTCOSV refresh
  2. 2026-07-11 08:24 UTCEPSS rescore
  3. 2026-07-09 19:06 UTCEPSS rescore
  4. 2026-07-08 15:10 UTCEPSS rescore
  5. 2026-07-07 13:42 UTCEPSS rescore
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  17. 2026-06-27 03:05 UTCEPSS rescore
  18. 2026-06-25 13:47 UTCEPSS rescore
  19. 2026-06-24 14:02 UTCEPSS rescore
  20. 2026-06-23 21:30 UTCEPSS rescore
  21. 2026-06-23 08:00 UTCOSV refresh
  22. 2026-06-22 14:23 UTCEPSS rescore
  23. 2026-06-21 14:54 UTCEPSS rescore
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  25. 2026-06-21 01:57 UTCEPSS rescore
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  27. 2026-06-19 19:23 UTCEPSS rescore
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  35. 2026-06-13 22:57 UTCEPSS rescore
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  37. 2026-06-12 23:09 UTCEPSS rescore
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  39. 2026-06-08 14:14 UTCEPSS rescore
  40. 2026-06-07 15:22 UTCEPSS rescore
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  42. 2026-06-06 13:45 UTCEPSS rescore
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  44. 2026-06-06 07:04 UTCOSV refresh
  45. 2026-06-05 22:44 UTCEPSS rescore
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  48. 2026-06-04 13:10 UTCEPSS rescore
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  50. 2026-06-02 20:10 UTCEPSS rescore
  51. 2026-06-01 13:49 UTCEPSS rescore
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  53. 2026-05-31 22:28 UTCEPSS rescore
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  55. 2026-05-31 00:14 UTCEPSS rescore
  56. 2026-05-29 13:41 UTCEPSS rescore
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  59. 2026-05-27 13:38 UTCEPSS rescore
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  63. 2026-05-26 07:17 UTCEPSS rescore
  64. 2026-05-24 16:44 UTCEPSS rescore
  65. 2026-05-22 14:57 UTCEG score recompute
  66. 2026-05-22 14:56 UTCGHSA enrichment
  67. 2026-05-20 22:37 UTCEPSS rescore
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  70. 2026-05-20 11:21 UTCEPSS rescore
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  72. 2026-05-18 21:30 UTCEPSS rescore
  73. 2026-05-18 21:30 UTCEPSS rescore
  74. 2026-05-18 21:30 UTCEPSS rescore

Related CVEs(same CWE)

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 10.3% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-9463, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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