CVE-2021-24223: The N5 Upload Form WordPress plugin through 1.0 suffers from an arbitrary file upload issue in page where a Fo

Q: How do I fix CVE-2021-24223?

n5 upload form: upgrade to newer than 1.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-24223 being exploited?

CVE-2021-24223 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-24223 affect?

CVE-2021-24223 affects n5 upload form. Severity is critical (CVSS 9.8). The N5 Upload Form WordPress plugin through 1.0 suffers from an arbitrary file upload issue in page where a Form from the plugin is embed, as any file can be uploaded. The uploaded filename might be hard to guess as it's generated with md5(

Q: How urgent is CVE-2021-24223?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-24223 is a critical-severity flaw (CVSS 9.8) affecting n5 upload form. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The N5 Upload Form WordPress plugin through 1.0 suffers from an arbitrary file upload issue in page where a Form from the plugin is embed, as any file can be uploaded. The uploaded filename might be hard to guess as it's generated with md5(uniqid(rand())), however, in the case of misconfigured servers with Directory listing enabled, accessing it is trivial.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-04-12
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: n5 upload form project

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

Am I affected?

Timeline

2021-04-12 14:15 UTCPublished CVE record published
2026-06-17 03:39 UTCUpdated Record last modified

n5 upload form project n5 upload form UPGRADE

Affected: <= 1.0

Fixed in: newer than 1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy n5-upload-form || rpm -q n5-upload-form || n5-upload-form --version

2. UPGRADE to newer than 1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade n5-upload-form

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade n5-upload-form

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2021-24223?

n5 upload form: upgrade to newer than 1.0. Exact commands for each OS are on this page.

Is CVE-2021-24223 being exploited?

CVE-2021-24223 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-2021-24223 affect?

CVE-2021-24223 affects n5 upload form. Severity is critical (CVSS 9.8). The N5 Upload Form WordPress plugin through 1.0 suffers from an arbitrary file upload issue in page where a Form from the plugin is embed, as any file can be uploaded. The uploaded filename might be hard to guess as it's generated with md5(

How urgent is CVE-2021-24223?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities

References

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