CVE-2016-4566: n/a vulnerability

CVE-2016-4566: Cross-site scripting (XSS) vulnerability in plupload.flash.swf in Plupload before 2.1.9, as used in WordPre...

Cross-site scripting (XSS) vulnerability in plupload.flash.swf in Plupload before 2.1.9, as used in WordPress before 4.5.2, allows remote attackers to inject arbitrary web script or HTML via a Same-Origin Method Execution (SOME) attack.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 00:32 UTC (UTC+00:00)

Security readout for executives and security teams

This CVE affects older WordPress and Plupload deployments. A vulnerable Flash upload component could let a remote attacker make script or HTML run in the site’s origin through a SOME-style XSS attack. That can threaten user sessions, admin actions, and site integrity, especially on unpatched legacy sites. Exposure is most likely on legacy WordPress installations earlier than 4.5.2 or custom applications that bundled Plupload before 2.1.9 and still serve plupload.flash.swf. Modern fully updated WordPress sites should not be exposed through the described bundled component. Treat this as a legacy hygiene and exposure-reduction issue. It is not KEV-listed in the provided data, but affected sites can face account and content integrity risk if old WordPress or Plupload components remain public. Mitigation focus: Upgrade WordPress installations to 4.5.2 or later.; Update embedded Plupload libraries to 2.1.9 or later.; Remove or disable the Flash uploader component if it is unnecessary..

Prepared: Jun 13, 2026, 14:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 22, 2016, 01:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://core.trac.wordpress.org/changeset/37382/CVE reference · x_refsource_CONFIRM
https://wpvulndb.com/vulnerabilities/8489CVE reference · x_refsource_MISC
https://codex.wordpress.org/Version_4.5.2CVE reference · x_refsource_CONFIRM
https://wordpress.org/news/2016/05/wordpress-4-5-2/CVE reference · x_refsource_CONFIRM
https://gist.github.com/cure53/09a81530a44f6b8173f545accc9ed07eCVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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