Is CVE-2016-9459 in the CISA KEV catalog?

No. CVE-2016-9459 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-9459?

CVE-2016-9459 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2016-9459?

CVE-2016-9459 has an EPSS score of 1.49% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-9459?

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

CVE & CISA-KEV Catalog

CVE-2016-9459

MEDIUMEPSS 71th pctl

6.1

CVSS v3

NVD

Description

Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4 are vulnerable to a log pollution vulnerability potentially leading to a local XSS. The download log functionality in the admin screen is delivering the log in JSON format to the end-user. The file was delivered with an attachment disposition forcing the browser to download the document. However, Firefox running on Microsoft Windows would offer the user to open the data in the browser as an HTML document. Thus any injected data in the log would be executed.

CWE-209 CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

nextcloud serverNVD

Affected:< 9.0.52Fixed in:9.0.52CVE-2016-9459derived from NVD

owncloudNVD

Affected:< 9.0.4Fixed in:9.0.4CVE-2016-9459derived 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 RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.49%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Patch6

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.