CVE-2021-24253

Name: CVE-2021-24253
Creator: NVD / NIST
Published: 2021-05-06T13:15:11.797+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.91%

Last modified Jun 17, 2026

CVE-2021-24253 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 1.91% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.91%

77.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Classyfrieds Project	Classyfrieds	<= 3.8

References

https://github.com/jinhuang1102/CVE-ID-Reports/blob/master/classyfrieds.mdExploit, Third Party Advisory
https://wpscan.com/vulnerability/ee42c233-0ff6-4b27-a5ec-ad3246bef079Exploit, Third Party Advisory
https://github.com/jinhuang1102/CVE-ID-Reports/blob/master/classyfrieds.mdExploit, Third Party Advisory
https://wpscan.com/vulnerability/ee42c233-0ff6-4b27-a5ec-ad3246bef079Exploit, Third Party Advisory

Timeline

Published: May 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24253?

How severe is CVE-2021-24253?

CVE-2021-24253 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.91% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24253?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-24253?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST