CVE-2023-4521

Name: CVE-2023-4521
Creator: NVD / NIST
Published: 2023-09-25T16:15:15.297+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 39.55%

Last modified Jun 17, 2026

CVE-2023-4521 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The Import XML and RSS Feeds WordPress plugin before 2.1.5 contains a web shell, allowing unauthenticated attackers to perform RCE. The plugin/vendor was not compromised and the files are the result of running a PoC for a previously reported issue (https://wpscan.com/vulnerability/d4220025-2272-4d5f-9703-4b2ac4a51c42) and not deleting the created files when releasing the new version.. EPSS estimates a 39.55% chance of exploitation in the next 30 days.

Description

The Import XML and RSS Feeds WordPress plugin before 2.1.5 contains a web shell, allowing unauthenticated attackers to perform RCE. The plugin/vendor was not compromised and the files are the result of running a PoC for a previously reported issue (https://wpscan.com/vulnerability/d4220025-2272-4d5f-9703-4b2ac4a51c42) and not deleting the created files when releasing the new version.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

39.55%

98.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mooveagency	Import Xml And Rss Feeds	< 2.1.5

References

https://wpscan.com/vulnerability/de2cdb38-3a9f-448e-b564-a798d1e93481Exploit, Third Party Advisory
https://wpscan.com/vulnerability/de2cdb38-3a9f-448e-b564-a798d1e93481Exploit, Third Party Advisory

Timeline

Published: Sep 25, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-4521?

How severe is CVE-2023-4521?

CVE-2023-4521 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 39.55% probability of exploitation in the next 30 days.

How do I fix CVE-2023-4521?

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-2023-4521?

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

Scan your code now

Source: NVD / NIST