CVE-2021-39325 - CVE House
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Status published Medium CVE-2021-39325

OptinMonster <= 2.6.0 Reflected Cross-Site Scripting

Vulnerability Description

The OptinMonster WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to insufficient input validation in the load_previews function found in the ~/OMAPI/Output.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 2.6.0.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Mariia Aleksandrova

References

More from OptinMonster

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CVE-2021-39341
OptinMonster <= 2.6.4 Unprotected REST-API Endpoints
High 8.2

Affected Vendor

OptinMonster

View all reports →

Affected Software

OptinMonster
Vulnerable Versions:
2.6.0

Timeline

Official Publish: September 20th, 2021
Last Modified: March 31st, 2025
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

CWE-79

MITRE ATT&CK TTPs

T1189 Drive-by Compromise
Initial Access
T1059.007 JavaScript
Execution
T1539 Steal Web Session Cookie
Collection
T1213 Data from Information Repositories
Collection
T1567 Exfiltration Over Web Service
Exfiltration
T1491.001 Defacement
Impact