Auth bypass in Optinmonster
CVE-2021-39341
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.219 (97.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.219 · newest: 0.219 · change: 0.000
Affected products
- Optinmonster — versions 2.6.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.wordfence.com/blog/2021/10/1000000-sites-affected-by-optinmonster-vulnerabi… (Exploit, Third Party Advisory)
- wordfence.com/vulnerability-advisories/ (Third Party Advisory)
- plugins.trac.wordpress.org/browser/optinmonster/trunk/OMAPI/RestApi.php (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-39341?
- CVE-2021-39341 is a high-severity vulnerability in Optinmonster, classified under Improper Authorization. CVSS score: 8.2/10. Published 2021-11-01.
- How severe is CVE-2021-39341?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2021-39341 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.