CVE-2026-100386

Ultra Addons for Contact Form 7 <= 3.5.54 - Unauthenticated Arbitrary File Read via CF7 Field Value in mPDF WriteHTML SVG Parser

2026-11-09 18:10
Eunho Kim

Strategic Overview

Status
Patched in 3.5.55
Affected Plugin
Ultra Addons for Contact Form 7
Affected Version
<= 3.5.54
CVSS
7.5High
Weakness type
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory
CVE
CVE-2026-100386
View all Ultra Addons for Contact Form 7 vulnerabilities

At a glance

CVE-2026-100386 is a high-severity Improper Limitation of a Pathname to a Restricted Directory vulnerability in the Ultra Addons for Contact Form 7 WordPress plugin, affecting versions <= 3.5.54. It carries a CVSS score of 7.5 (reachable over the network; low attack complexity; high confidentiality impact). Exploitation requires no authentication. The issue is fixed in version 3.5.55; sites on affected versions should update now. Disclosed November 2026, reported by Eunho Kim.

Vulnerability Overview

The Ultra Addons for Contact Form 7 plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 3.5.54 via the uacf7_wpcf7_mail_components function. This makes it possible for unauthenticated attackers to read the contents of arbitrary files on the server, which can contain sensitive information. Exploitation requires the PDF Generator addon to be active and an administrator-configured PDF body template to be enabled for the targeted contact form.

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, and no interaction from a victim user. A successful exploit has high impact on confidentiality.

CWE-22: Improper Limitation of a Pathname to a Restricted Directory

Reaching this weakness in Ultra Addons for Contact Form 7 <= 3.5.54 takes no account at all. Path traversal happens when user-controlled text is used to build a filesystem path without being constrained to an intended directory, so sequences like ../ walk the resolved path somewhere else.

Depending on the operation, it means reading files outside the intended folder — wp-config.php being the usual target — or writing to and deleting paths the web server can touch. For Ultra Addons for Contact Form 7 the fix is 3.5.55: builds <= 3.5.54 are affected, anything from 3.5.55 onward is not.

Remediation

Update to version 3.5.55, 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: Ultra Addons for Contact Form 7 3.5.55 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-2026-100386https://www.wordfence.com/threat-intel/vulnerabilities/id/a52d6222-688f-4300-b53d-db2cc31f924ahttps://nvd.nist.gov/vuln/detail/CVE-2026-100386

Related records

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