CVE-2021-39341

HIGH 8.2CVE-2021-39341 · Published 01/11/2021 · updated 17/06/2026

Package	Affected versions	Patched versions
optinmonster optinmonster	`≤ 2.6.4`	No fix yet

Description

The OptinMonster WordPress plugin is vulnerable to sensitive information disclosure and unauthorized setting updates due to insufficient authorization validation via the logged_in_or_has_api_key function in the ~/OMAPI/RestApi.php file that can used to exploit inject malicious web scripts on sites with the plugin installed. This affects versions up to, and including, 2.6.4.

References

plugins.trac.wordpress.org/browser/optinmonster/trunk/OMAPI/RestApi.php · Third Party Advisory
wordfence.com/vulnerability-advisories · Third Party Advisory
wordfence.com/blog/2021/10/1000000-sites-affected-by-optinmonster-vulnerabilities · Exploit

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