CVE-2026-18100 json
MetForm <= 4.1.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'mf_form_id' Widget Setting
published 2026-08-25 2 mo ago modified 2026-08-26 2 mo ago also EUVD-2026-65315
- cvss
- 6.4
- 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 32%
- public exploits
- 0
- none known
Summary
The MetForm – Contact Form, Survey, Quiz, & Custom Form Builder for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'mf_form_id' Widget Setting in all versions up to, and including, 4.1.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses Elementor's save-time wp_kses_post filter because it contains no HTML tags, and MetForm's own str_replace transformation of script tags into JavaScript template literal expressions provides an additional delivery path.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- roxnor MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/976f1f01-ad5d-413e-a208-ae4b71a61502?source=cve
- plugins.trac.wordpress.org /browser/metform/tags/4.1.8/utils/util.php#L605
- plugins.trac.wordpress.org /browser/metform/tags/4.1.8/controls/form-picker-utils.php#L45
- plugins.trac.wordpress.org /browser/metform/tags/4.1.8/widgets/form.php#L143
- plugins.trac.wordpress.org /browser/metform/tags/4.1.4/utils/util.php#L605
- plugins.trac.wordpress.org /browser/metform/tags/4.1.4/controls/form-picker-utils.php#L45
- plugins.trac.wordpress.org /browser/metform/tags/4.1.4/widgets/form.php#L143
- plugins.trac.wordpress.org /changeset?reponame=&new=3639278%40metform%2Ftrunk&old=3618333%40metform%2Ftrunk
Sources
- CVE List CVE-2026-18100
- NVD CVE-2026-18100
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.