CVE-2021-39325

Name: CVE-2021-39325
Creator: NVD / NIST
Published: 2021-09-20T20:15:11.65+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.88%

Last modified Jun 17, 2026

CVE-2021-39325 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. The OptinMonster WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to insufficient input validation in the load_previews function found in the ~/OMAPI/Output.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 2.6.0.. EPSS estimates a 0.88% chance of exploitation in the next 30 days.

Description

The OptinMonster WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to insufficient input validation in the load_previews function found in the ~/OMAPI/Output.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 2.6.0.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.88%

54.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Optinmonster	Optinmonster	<= 2.6.0

References

https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2595758%40optinmonster&new=2595758%40optinmonster&sfp_email=&sfph_mail=#file2Patch, Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39325Third Party Advisory
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2595758%40optinmonster&new=2595758%40optinmonster&sfp_email=&sfph_mail=#file2Patch, Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39325Third Party Advisory

Timeline

Published: Sep 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39325?

How severe is CVE-2021-39325?

CVE-2021-39325 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.88% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39325?

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-2021-39325?

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

Scan your code now

Source: NVD / NIST