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Forminator Forms CVE-2026-18324

| EUVDEUVD-2026-67405 HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-08-28 Wordfence GHSA-j6r2-54rm-cr23
7.2
CVSS 3.1 · Vendor: Wordfence
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Submit crafted rich-text payload via public form
  2. Delivery
    Bypass unsanitized input processing in textarea.php
  3. Exploit
    Malicious script stored in WordPress database
  4. Execution
    Administrator or visitor loads form entries page
  5. Persist
    Injected script executes in victim browser context
  6. Impact
    Steal session token or perform actions as victim

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires that at least one Textarea field within a published Forminator form has the Rich-Text editor option explicitly enabled - this is a non-default, administrator-configured setting, and forms using standard plain-text textarea fields are not affected. No authentication is required from the attacker to submit the malicious form entry (CVSS PR:N confirmed). Successful script execution is gated on a victim - typically an administrator reviewing entries - loading a page or admin view that renders the stored malicious content; the attacker cannot force this action directly. Exploitation is limited to WordPress installations running plugin versions 1.57.0.1 or earlier. Sites on version 1.57.0.2 or later are not affected.

Impact

The CVSS 7.2 score reflects a network-accessible, no-privileges-required, scope-changing vulnerability - signals that typically indicate high urgency. However, a critical moderating factor is that exploitation requires the Rich-Text editor option to be explicitly enabled on the target Textarea field, which is not a default configuration; sites that have never enabled this option are not exposed. No EPSS data was provided in the input, and no CISA KEV listing exists, indicating no confirmed widespread exploitation. The absence of a known public POC further tempers urgency beyond the CVSS headline. The provided CVSS vector assigns UI:N, but stored XSS inherently requires a victim to load the affected page - this metric assignment is inconsistent with standard CVSS 3.1 guidance for stored XSS and may overstate exploitability score. Practically, the impact is most significant when form entries are reviewed by authenticated administrators, enabling session hijacking or privilege escalation within the WordPress dashboard. Organizations running Forminator Forms with Rich-Text Textarea fields enabled should treat patching as high priority within normal patch cycles rather than emergency response.

Exploit ScenarioDerived

An unauthenticated attacker identifies a WordPress site running Forminator Forms with a contact or inquiry form containing a Rich-Text Textarea field with the rich-text editor enabled. The attacker submits the form with a crafted payload - such as an image onerror handler or script tag embedded in the rich-text content - which is stored in the WordPress database without sanitization. When a site administrator later reviews form submissions in the WordPress backend, the stored script executes in the administrator's browser, potentially stealing session cookies, capturing credentials, or creating a rogue admin account.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Aug 28, 2026

Stored Cross-Site Scripting in the Forminator Forms WordPress plugin (all versions through 1.57.0.1) enables unauthenticated attackers to inject persistent malicious scripts via Rich-Text Textarea fields, which execute in any visitor's or administrator's browser upon page access. The flaw originates from insufficient input sanitization at submission time and missing output escaping at render time, with vulnerable code paths confirmed across multiple plugin files including textarea.php, abstract-class-front-action.php, and admin-page-entries.php. A patched release (1.57.0.2) is confirmed available via the WordPress plugin repository changeset; no public exploit code or CISA KEV listing has been identified at time of analysis.

RemediationAI

The primary fix is to update the Forminator Forms plugin to version 1.57.0.2 or later, confirmed as the patched release via the WordPress plugin repository changeset (https://plugins.trac.wordpress.org/changeset?old_path=%2Fforminator/tags/1.57.0.1&new_path=%2Fforminator/tags/1.57.0.2). Updates can be applied through the WordPress admin dashboard under Plugins > Installed Plugins or via WP-CLI. As a compensating control for sites unable to patch immediately, administrators should disable the Rich-Text editor option on all Textarea fields in Forminator forms - this directly eliminates the exploitation vector but reduces form functionality for users who rely on formatted text input. After patching, administrators should review and sanitize existing stored form entries that may contain injected payloads, as the patch corrects future output escaping but does not automatically cleanse historical stored content. Restricting access to form entry admin pages to the minimum necessary administrator accounts also limits the blast radius of any successful stored XSS execution.

Affected VersionsENISA

Forminator Forms – Contact Form, Payment Form & Custom Form Builder 0 ≤1.57.0.1

Affected Packages

euvd forminator_forms_contact_form_payment_form_custom_form_builder no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The vulnerability is a classic CWE-79 (Improper Neutralization of Input During Web Page Generation) manifesting as stored XSS in the WPMU Dev Forminator Forms plugin (CPE: cpe:2.3:a:wpmudev:forminator_forms_-_contact_form,_payment_form_&_custom_form_builder:*:*:*:*:*:*:*:*). When a Textarea field is configured with the Rich-Text editor option, the plugin invokes a WYSIWYG editor (shared-ui.min.js) that permits HTML markup input. The plugin fails to sanitize this markup server-side before storage (exploited path: library/fields/textarea.php line 411, library/abstracts/abstract-class-front-action.php line 127) and fails to escape the stored content on output in both admin entry views (library/modules/custom-forms/admin/admin-page-entries.php line 338, admin/views/custom-form/entries/content-details.php line 211). This dual failure - missing input sanitization and missing output escaping - is the canonical stored XSS pattern. The scope-changed CVSS metric (S:C) reflects that the injected script executes in victims' browser contexts rather than the server context.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (Wordfence) PRIMARY 7.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
vuln.today AI 6.1 MEDIUM

UI:R applied because stored XSS requires a victim to load the affected page; all other metrics align with the reported vector.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (Wordfence).

CVSS VectorVendor: Wordfence

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

DescriptionCVE.org

The Forminator Forms - Contact Form, Payment Form & Custom Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Rich-Text Textarea Field in all versions up to, and including, 1.57.0.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires that the targeted Textarea field has the Rich-Text editor option enabled.

Executive ViewAI

Why It Matters

Forminator Forms WordPress plugin (versions through 1.57.0.1) contains a stored cross-site scripting vulnerability that allows unauthenticated attackers to inject persistent malicious scripts executable by all website visitors and administrators. Organizations using this plugin for customer-facing forms face direct risk of malware delivery, credential theft, session hijacking, and website defacement affecting customers and staff. Immediate patching to version 1.57.0.2 is critical to eliminate the attack vector.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.3%
Top 78% exploitable
Prevalence
High
popular WordPress form builder with large active global install base
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.3%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Partial

Priority Score

36
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

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References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-18324 REF https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/admin/views/custom-form/entries/content-details.php#L211 REF https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/build/js/shared-ui.min.js#L1 REF https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/abstracts/abstract-class-front-action.php#L127 REF https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/fields/textarea.php#L411 REF https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/modules/custom-forms/admin/admin-page-entries.php#L338 REF https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/admin/views/custom-form/entries/content-details.php#L211 REF https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/build/js/shared-ui.min.js#L1 REF https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/library/abstracts/abstract-class-front-action.php#L127 REF https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/library/fields/textarea.php#L411 REF https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/library/modules/custom-forms/admin/admin-page-entries.php#L338 REF https://plugins.trac.wordpress.org/changeset/3652712/forminator/trunk/library/modules/custom-forms/admin/admin-page-entries.php REF https://plugins.trac.wordpress.org/changeset?old_path=%2Fforminator/tags/1.57.0.1&new_path=%2Fforminator/tags/1.57.0.2 REF https://www.wordfence.com/threat-intel/vulnerabilities/id/5f8a0704-1c06-4342-b05a-7bd815a87833?source=cve

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