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CVE-2026-65051— Ninja Forms Server-Side Validation Bypass via Client-Controlled Field Metadata Merge in AJAX Submission Handler

Quick assessment

Affected
Saturday Drive Ninja Forms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Ninja Forms是WordPress基金会的一款信息化产品。 WordPress Ninja Forms 3.14.8版本存在处理逻辑错误漏洞，该漏洞源于客户端执行服务端安全策略，可能导致未经身份验证的攻击者通过将攻击者控制的字段元数据合并到服务加载的表单定义中，绕过所有表单验证。

CVSS 6.5 · Medium EPSS 0.28% · P21

Affected Version Matrix 2

VendorProduct Version RangeStatus
Saturday Drive Ninja Forms < 3.14.9 affected
3.14.9 unaffected
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I. Basic Information for CVE-2026-65051

Vulnerability Information
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Vulnerability Title
Ninja Forms Server-Side Validation Bypass via Client-Controlled Field Metadata Merge in AJAX Submission Handler
Source: CVE Program / CVE List V5
Vulnerability Description
Ninja Forms WordPress plugin version 3.14.8 contains a client-side enforcement of server-side security vulnerability that allows unauthenticated attackers to bypass all form validation by merging attacker-controlled field metadata over server-loaded form definitions before validation runs. Attackers can craft a malicious AJAX submission overriding field types, removing required flags, and disabling CAPTCHA checks through the nopriv AJAX endpoint to trigger form actions such as email notifications and database storage with unverified, attacker-controlled content.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端安全的客户端实施
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Ninja Forms 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Ninja Forms是WordPress基金会的一款信息化产品。 WordPress Ninja Forms 3.14.8版本存在处理逻辑错误漏洞，该漏洞源于客户端执行服务端安全策略，可能导致未经身份验证的攻击者通过将攻击者控制的字段元数据合并到服务加载的表单定义中，绕过所有表单验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Saturday Drive Ninja Forms 0 ~ 3.14.9 -

II. Public POCs for CVE-2026-65051

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III. Intelligence Information for CVE-2026-65051

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Vendor Advisories for CVE-2026-65051 (1)

Vendor Pages for CVE-2026-65051 (1)

Same Patch Batch · Saturday Drive · 2026-07-21 · 5 CVEs total

CVE-2026-65048 9.3 CRITICAL Ninja Forms Unauthenticated Stored Cross-Site Scripting via Repeatable Fieldset Submission
CVE-2026-65049 9.3 CRITICAL Ninja Forms Cross-Site Network-Wide Data Deletion on WordPress Multisite via nf_delete_all
CVE-2026-65052 7.5 HIGH Ninja Forms Calculation and Payment Total Tampering via Fail-Open get_calc_value in ListSe
CVE-2026-65050 6.5 MEDIUM Ninja Forms Missing Authorization in submissions-table Gutenberg Block Discloses Form Subm

IV. Related Vulnerabilities

Same product: Ninja Forms
Same vendor: Saturday Drive
Same weakness: CWE-602

V. Comments for CVE-2026-65051

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