Is CVE-2016-9461 in the CISA KEV catalog?

No. CVE-2016-9461 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-9461?

CVE-2016-9461 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2016-9461?

CVE-2016-9461 has an EPSS score of 2.00% (78th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-9461?

Upgrade nextcloud server to 9.0.52 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2016-9461

MEDIUMEPSS 78th pctl

4.3

CVSS v3

NVD

Description

Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4 are not properly verifying edit check permissions on WebDAV copy actions. The WebDAV endpoint was not properly checking the permission on a WebDAV COPY action. This allowed an authenticated attacker with access to a read-only share to put new files in there. It was not possible to modify existing files.

CWE-275 CWE-284Improper Access Control

How to fix

Remediation Available

nextcloud serverNVD

Affected:< 9.0.52Fixed in:9.0.52CVE-2016-9461derived from NVD

owncloudNVD

Affected:< 9.0.4Fixed in:9.0.4CVE-2016-9461derived 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

2.00%probability of exploitation in 30 days

78thpercentile

Elevated risk: more likely to be exploited than 78% of all known CVEs.

References

Patch7

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.