CVE-2026-101326 json
Ninja Forms <= 3.15.5 - Authenticated (Subscriber+) Arbitrary Shortcode Execution via '{wp:user_display_name}' Merge Tag via display_name
published 2026-10-31 9 d ago modified 2026-11-05 3 d ago also EUVD-2026-114572
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 31%
- 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 authenticated attackers, with subscriber-level access and above, to execute arbitrary shortcodes. Exploitation requires that an administrator has configured at least one Ninja Forms field with its Default Value set to the {wp:user_display_name} merge tag on a publicly accessible page; a Subscriber need only set their display_name to a shortcode string via their profile and then visit that page.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 d ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/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/05dccb32-e638-4929-a788-3998bc3acd75?source=cve
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/MergeTags/WP.php#L189
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/Display/Render.php#L278
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/Display/Render.php#L268
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/Config/MergeTagsWP.php#L128
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/Abstracts/MergeTags.php#L94
- wordpress.org /plugins/ninja-forms/
- plugins.trac.wordpress.org /changeset/3749135/ninja-forms/trunk/includes/Display/Render.php
Sources
- CVE List CVE-2026-101326
- NVD CVE-2026-101326
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.