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CVE-2026-100155— Ninja Forms <= 3.15.5 - Unauthenticated Arbitrary Shortcode Execution via 'formData' Field Value via Success Message Merge Tag

Quick assessment

Affected

kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder

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 插件"Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder"在 3.15.5 及以下的所有版本中，存在任意短代码执行漏洞。该漏洞源于软件在执行之前，未对传入的值进行适当验证，从而允许未认证的攻击者执行任意短代码。

CVSS 6.5 · Medium Updated Oct 31, 2026

Possible ATT&CK Techniques 2 AI

T1059.007 · JavaScript T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Ninja Forms <= 3.15.5 - Unauthenticated Arbitrary Shortcode Execution via 'formData' Field Value via Success Message Merge Tag

Source: CVE Program / CVE List V5

Vulnerability Description

The The Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 3.15.5 This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

对生成代码的控制不恰当(代码注入)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
kstover	Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder	0 ~ 3.15.5	-

II. Public POCs for CVE-2026-100155

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-100155

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Vendor Pages for CVE-2026-100155 (1)

🔗 Ninja Forms – The Contact Form Builder That Grows With You – WordPress plugin | WordPress.org Read full article

Other References for CVE-2026-100155 (8)

https://www.cve.org/CVERecord?id=CVE-2026-100155

Same Patch Batch · kstover · 2026-10-31 · 3 CVEs total

CVE-2026-109997	7.2 HIGH	Ninja Forms <= 3.15.5 - Unauthenticated Stored Cross-Site Scripting via 'extra' Parameter
CVE-2026-101326	5.4 MEDIUM	Ninja Forms <= 3.15.5 - Authenticated (Subscriber+) Arbitrary Shortcode Execution via '{wp

IV. Related Vulnerabilities

Same product: Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder

Same vendor: kstover

Same weakness: CWE-94