CVE-2026-3986
Received Received - Intake

Stored XSS in WordPress Calculated Fields Form Plugin Allows Script Injection

Publication date: 2026-03-13

Last updated on: 2026-03-13

Assigner: Wordfence

Description
The Calculated Fields Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the form settings in all versions up to, and including, 5.4.5.0. This is due to insufficient capability checks on the form settings save handler and insufficient input sanitization of the `fcontent` field in `fhtml` field types. 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.

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Meta Information

Published
2026-03-13
Last Modified
2026-03-13
Generated
2026-07-06
AI Q&A
2026-03-13
EPSS Evaluated
2026-07-05
NVD
CVE-2026-3986
EUVD
EUVD-2026-11770

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
calculated_fields_form calculated_fields_form to 5.4.5.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

The Calculated Fields Form plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in all versions up to and including 5.4.5.0. This vulnerability arises because the plugin does not properly check user capabilities when saving form settings and fails to sufficiently sanitize input in the 'fcontent' field within 'fhtml' field types. As a result, authenticated users with Contributor-level access or higher can inject malicious scripts into pages, which will execute whenever those pages are accessed.

Impact Analysis

This vulnerability can allow attackers with Contributor-level access or above to inject arbitrary web scripts into pages. These scripts execute when users visit the affected pages, potentially leading to theft of user credentials, session hijacking, defacement, or distribution of malware. Because the vulnerability involves stored scripts, the impact can affect multiple users repeatedly.

Compliance Impact

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