CVE-2021-39341 OptinMonster <= 2.6.4 Unprotected REST-API Endpoints
Attackers can access sensitive information and modify settings via unprotected REST API endpoints in the OptinMonster WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-39341?
CVE-2021-39341 is a high-severity missing authorization vulnerability in OptinMonster, published on 1 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2021-39341?
It affects 1 product.
Products include Optinmonster Optinmonster.
How do I fix CVE-2021-39341?
No fix has been published for CVE-2021-39341 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-39341 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-39341 exists.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in OptinMonster
- CVE-2023-0772 Popup Builder by OptinMonster < 2.12.2 - Subscriber+ Arbitrary Post Content Disclosure
- CVE-2024-4045 Cross-site scripting in Popup Builder & Popup Maker for WordPress – OptinMonster Email Marketing and Lead Generation
- CVE-2021-39325 OptinMonster <= 2.6.0 Reflected Cross-Site Scripting
- CVE-2016-10996 Missing authorization in n/a
Sources
Also known as GHSA-whcc-jgf3-q7pm.