Is CVE-2016-9464 in the CISA KEV catalog?

No. CVE-2016-9464 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-9464?

CVE-2016-9464 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2016-9464?

CVE-2016-9464 has an EPSS score of 1.62% (73th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-9464?

Upgrade nextcloud server to 9.0.54 or later.

CVE & CISA-KEV Catalog

CVE-2016-9464

MEDIUMEPSS 73th pctl

4.3

CVSS v3

NVD

Description

Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares. The Sharing Backend as implemented in Nextcloud does differentiate between shares to users and groups. In case of a received group share, users should be able to unshare the file to themselves but not to the whole group. The previous API implementation simply unshared the file to all users in the group.

CWE-285

How to fix

Remediation Available

nextcloud serverNVD

Affected:< 9.0.54Fixed in:9.0.54CVE-2016-9464derived 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 ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.62%probability of exploitation in 30 days

73rdpercentile

Elevated risk: more likely to be exploited than 73% of all known CVEs.

References

Patch5

Exploit1

hackerone.com

Third-Party Advisory1

securityfocus.com

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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.