CVE-2026-4373 json
JetFormBuilder <= 3.5.6.2 - Unauthenticated Arbitrary File Read via Media Field
published 7mo ago modified 4mo ago also EUVD-2026-14240
- cvss
- 7.5
- 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 35%
- public exploits
- 0
- none known
Summary
The JetFormBuilder plugin for WordPress is vulnerable to arbitrary file read via path traversal in all versions up to, and including, 3.5.6.2. This is due to the 'Uploaded_File::set_from_array' method accepting user-supplied file paths from the Media Field preset JSON payload without validating that the path belongs to the WordPress uploads directory. Combined with an insufficient same-file check in 'File_Tools::is_same_file' that only compares basenames, this makes it possible for unauthenticated attackers to exfiltrate arbitrary local files as email attachments by submitting a crafted form request when the form is configured with a Media Field and a Send Email action with file attachment.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected products
- jetmonsters JetFormBuilder — Dynamic Blocks Form Builder
Classification
- Weakness
-
- CWE-36 Absolute Path Traversal
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/1801fd3e-d56f-4540-9700-9e9de8b465e1?source=cve
- plugins.trac.wordpress.org /browser/jetformbuilder/tags/3.5.6.2/includes/classes/resources/uploaded-file.php#L99
- plugins.trac.wordpress.org /browser/jetformbuilder/tags/3.5.6.2/modules/block-parsers/file-uploader.php#L313
- plugins.trac.wordpress.org /browser/jetformbuilder/tags/3.5.6.2/modules/actions-v2/send-email/send-email-action.php#L214
- plugins.trac.wordpress.org /changeset/3486996/jetformbuilder
Sources
- CVE List CVE-2026-4373
- NVD CVE-2026-4373
Fencer Intel 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.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.