CVE-2021-39341

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure.

Exploit odds

21.9% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2021-08-20 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2021-11-01 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-06-17 04:03 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 21.9% in the next 30 days (EPSS).
• Severity: 8.2 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2021-11-01 21:15 UTC

Last modified

2026-06-17 04:03 UTC

Exploit probability

21.9% · EPSS, next 30 days

Weakness

CWE-285

Record status

Modified

Affected

• Optinmonster ≤ 2.6.4

Attack profile CVSS 3.1 · 8.2

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-39341.md and follow it. Check whether this project is affected by CVE-2021-39341. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

Copy as ticket · More options · Status badge