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CVE-2021-39325

MEDIUM 6.1 CVSS 3.1
Published
September 20, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Affected WordPress components

  • Popup Builder & Popup Maker for WordPress – OptinMonster Email Marketing and Lead Generation Plugin · optinmonster
    Confirmed match Active
    From 2.6.0 (including) to 2.6.0 (including); Up to and including 2.6.0
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • OptinMonster OptinMonster — From 2.6.0 (including) to 2.6.0 (including)
  • optinmonster optinmonster — Up to and including 2.6.0

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2595758%40optinmonster&new=2595758%40optinmonster&sfp_email=&sfph_mail=#file2 Patch, Third Party Advisory
  • www.wordfence.com https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39325 Third Party Advisory
  • nvd.nist.gov Official NVD record