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    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:Nov 1, 2021
    Last Modified:Mar 31, 2025
    EPS:Nov 1, 2021
    EPSS Score:0.21554
    CVSS Score:8.2

    Affected Products

    Vendor
    Optinmonster
    Product
    Optinmonster

    Exploits

    https://www.wordfence.com/blog/2021/10/1000000-sites-affected-by-optinmonster-vulnerabilities/https://www.wordfence.com/blog/2021/10/1000000-sites-affected-by-optinmonster-vulnerabilities/

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
    CAPEC-102 Session Sidejacking
    CAPEC-104 Cross Zone Scripting
    CAPEC-117 Interception
    CAPEC-127 Directory Indexing
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-17 Using Malicious Files
    CAPEC-383 Harvesting Information via API Event Monitoring
    CAPEC-39 Manipulating Opaque Client-based Data Tokens
    CAPEC-402 Bypassing ATA Password Security
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-477 Signature Spoofing by Mixing Signed and Unsigned Content
    CAPEC-5 Blue Boxing
    CAPEC-51 Poison Web Service Registry
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-647 Collect Data from Registries
    CAPEC-65 Sniff Application Code
    CAPEC-668 Key Negotiation of Bluetooth Attack (KNOB)
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-77 Manipulating User-Controlled Variables
    CAPEC-87 Forceful Browsing

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High