CVE-2026-100155 json
Ninja Forms <= 3.15.5 - Unauthenticated Arbitrary Shortcode Execution via 'formData' Field Value via Success Message Merge Tag
published 2026-10-31 9 d ago modified 2026-11-02 6 d ago also EUVD-2026-114578
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 44%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 6 d ago
Exploit prediction
0.51% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
Affected products
- kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/a1cf42f7-77c6-4594-a6a4-cebf5c3558d7?source=cve
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/Actions/SuccessMessage.php#L63
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/Actions/SuccessMessage.php#L70
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/AJAX/Controllers/Submission.php#L52
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/Abstracts/MergeTags.php#L64
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/MergeTags/Fields.php#L268
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/AJAX/Controllers/Submission.php#L60
- wordpress.org /plugins/ninja-forms/
- plugins.trac.wordpress.org /changeset?reponame=&new=3749135%40ninja-forms%2Ftags%2F3.15.6&old=3717122%40ninja-forms%2Ftags%2F3.15.5
Sources
- CVE List CVE-2026-100155
- NVD CVE-2026-100155
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.