CVE-2025-13861

HTML Forms – Simple WordPress Forms Plugin <= 1.6.0 - Unauthenticated Stored Cross-Site Scripting

2025-12-16 16:01
Itthidej Aramsri (Boeing777)

Strategic Overview

Status
Patched in 1.6.1
Affected Plugin
HTML Forms – Simple WordPress Forms Plugin
Affected Version
<= 1.6.0
CVSS
6.1Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2025-13861
View all HTML Forms – Simple WordPress Forms Plugin vulnerabilities

At a glance

CVE-2025-13861 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the HTML Forms WordPress plugin, affecting versions <= 1.6.0. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.6.1; sites on affected versions should update now. Disclosed December 2025, reported by Itthidej Aramsri (Boeing777).

Vulnerability Overview

The HTML Forms – Simple WordPress Forms Plugin for WordPress is vulnerable to Unauthenticated Stored Cross-Site Scripting in all versions up to and including 1.6.0 due to insufficient sanitization of fabricated file upload field metadata before displaying it in the WordPress admin dashboard. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute whenever an administrator accesses the form submissions page.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in HTML Forms <= 1.6.0 takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For HTML Forms the fix is 1.6.1: builds <= 1.6.0 are affected, anything from 1.6.1 onward is not.

Remediation

Update to version 1.6.1, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: HTML Forms 1.6.1 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2025-13861https://www.wordfence.com/threat-intel/vulnerabilities/id/52e2f1b9-d240-4813-9124-51bd6b047553https://nvd.nist.gov/vuln/detail/CVE-2025-13861

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C