CVE-2021-24253: The Classyfrieds WordPress plugin through 3.8 does not properly check the uploaded file when an authenticated

Q: How do I fix CVE-2021-24253?

classyfrieds: upgrade to newer than 3.8. Exact commands for each OS are on this page.

Q: Is CVE-2021-24253 being exploited?

CVE-2021-24253 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-2021-24253 affect?

CVE-2021-24253 affects classyfrieds. Severity is high (CVSS 8.8). The Classyfrieds WordPress plugin through 3.8 does not properly check the uploaded file when an authenticated user adds a listing, only checking the content-type in the request. This allows any authenticated user to upload arbitrary PHP fil

Q: How urgent is CVE-2021-24253?

Priority 56/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2021-24253 is a high-severity flaw (CVSS 8.8) affecting classyfrieds. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Classyfrieds WordPress plugin through 3.8 does not properly check the uploaded file when an authenticated user adds a listing, only checking the content-type in the request. This allows any authenticated user to upload arbitrary PHP files via the Add Listing feature of the plugin, leading to RCE.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.9% (top 20%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-05-06
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: classyfrieds project

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

Am I affected?

Timeline

2021-05-06 13:15 UTCPublished CVE record published
2026-06-17 03:39 UTCUpdated Record last modified

classyfrieds project classyfrieds UPGRADE

Affected: <= 3.8

Fixed in: newer than 3.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy classyfrieds || rpm -q classyfrieds || classyfrieds --version

2. UPGRADE to newer than 3.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade classyfrieds

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade classyfrieds

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-2021-24253?

classyfrieds: upgrade to newer than 3.8. Exact commands for each OS are on this page.

Is CVE-2021-24253 being exploited?

CVE-2021-24253 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-2021-24253 affect?

CVE-2021-24253 affects classyfrieds. Severity is high (CVSS 8.8). The Classyfrieds WordPress plugin through 3.8 does not properly check the uploaded file when an authenticated user adds a listing, only checking the content-type in the request. This allows any authenticated user to upload arbitrary PHP fil

How urgent is CVE-2021-24253?

Priority 56/100. High severity; Public exploit reference

Software pages

WordPress vulnerabilities · PHP vulnerabilities

References

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