CVE-2021-23562: This affects the package plupload before 2.3.9

Routine

MEDIUM 4.2UPGRADE

CVE-2021-23562 is a medium-severity flaw (CVSS 4.2) affecting plupload. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This affects the package plupload before 2.3.9. A file name containing JavaScript code could be uploaded and run. An attacker would need to trick a user to upload this kind of file.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.2 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-12-03
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: tiny

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-12-03 20:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

tiny plupload UPGRADE

Affected: < 2.3.9

Fixed in: 2.3.9

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls plupload

2. UPGRADE to 2.3.9

npm install plupload@">=2.3.9"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-23562?

plupload: upgrade to 2.3.9. Exact commands for each OS are on this page.

Is CVE-2021-23562 being exploited?

CVE-2021-23562 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-23562 affect?

CVE-2021-23562 affects plupload. Severity is medium (CVSS 4.2). This affects the package plupload before 2.3.9. A file name containing JavaScript code could be uploaded and run. An attacker would need to trick a user to upload this kind of file.

How urgent is CVE-2021-23562?

Priority 31/100. No elevated risk signals yet.

Related CVEs

CVE-2016-4566 MEDIUM 6.1 UPGRADE UPGRADE Cross-site scripting (XSS) vulnerability in plupload.flash.swf in Plupload before 2.1.9, as used in WordPress
CVE-2013-0237 MEDIUM 4.3 UPGRADE UPGRADE Cross-site scripting (XSS) vulnerability in Plupload.as in Moxiecode plupload before 1.5.5, as used in WordPre
CVE-2012-2401 MEDIUM 5.0 UPGRADE UPGRADE Plupload before 1.5.4, as used in wp-includes/js/plupload/ in WordPress before 3.3.2 and other products, enabl

References

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