CVE-2024-4045: Popup Builder by OptinMonster – WordPress Popups for Optins, Email Newsletters and Lead Generation <= 2.16.1 - Authenticated (Contributor+) Stored Cross-Site Scripting
Vulnerability summary
CVE-2024-4045 is a medium (CVSS 6.4) Cross-site Scripting vulnerability in optinmonster. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23.9% of scored vulnerabilities. Fixed in 2.16.2.
Timeline
- 25-05-2024PublishedVulnerability first disclosed.
- 08-04-2026Last modifiedVulnerability information updated.
Description
The Popup Builder by OptinMonster – WordPress Popups for Optins, Email Newsletters and Lead Generation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘campaign_id’ parameter in versions up to, and including, 2.16.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
CVSS metrics
3 scores · 3 sources · 1 version- NVDNIST5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:NDiffers
- wordfenceSource6.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
EPSS trend
Probability
0.32%
Chance of exploitation in the next 30 days
Percentile
24%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.32% on 22-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Optinmonster1 product
- optinmonster< 2.16.2
Smub1 product
Wordpress1 product
- optinmonster≤ 2.16.1 (fixed in 2.16.2)
3 vendors · 3 products