CVE-2021-36821 HIGH

CVE-2021-36821: WordPress Forminator plugin <= 1.14.11 - Stored Cross-Site Scripting (XSS) vulnerability

Vendor Wpmu Dev

Product Forminator

Weakness CWE-79 · XSS

Published March 16, 2023

Last update April 28, 2026

View on NVD All CVEs

CVSS base score

7.1/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction Required

Confidentiality Low

Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WPMU DEV Forminator allows Stored XSS.This issue affects Forminator: from n/a through 1.14.11.

Explanation of Vulnerability in Simple Terms

02Summary

Forminator versions up to 1.14.11 contain a stored cross-site scripting (XSS) vulnerability. An attacker can inject malicious scripts into form fields that execute in the browsers of site visitors and administrators. The vulnerability affects the form builder and submission handling, allowing theft of session tokens or credential harvesting. Update to version 1.55.0 or later to remediate.

What an attacker can do

03Attacker Capabilities

Inject malicious JavaScript into forms that runs in visitors' browsers and steals their session tokens or credentials.

Potential impact on your site

04Site Impact

Visitor and admin accounts can be compromised; form data may be exfiltrated; site reputation damaged.

Conditions required to exploit

05Prerequisites

Attacker needs to submit a form with malicious input; victim must view the affected form or admin panel.

Key dates

06Disclosure timeline

March 16, 2023 CVE published

April 28, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2021-36821 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html AskarLabs — CWE-79 write-up Cross-Site Scripting

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