Contact Form 7 Signature Addon Plugin up to 4.2.2 on WordPress signature path traversal

Summaryinfo

A vulnerability identified as problematic has been detected in Contact Form 7 Signature Addon Plugin up to 4.2.2. Affected is an unknown function. Performing a manipulation of the argument signature results in path traversal. This vulnerability was named CVE-2026-104246. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Contact Form 7 Signature Addon Plugin up to 4.2.2. This affects some unknown functionality. The manipulation of the argument signature with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. The summary by CVE is:

The Contact Form 7 Signature Addon WordPress plugin through 4.2.2 does not sanitize a signature field value before building an email attachment path from it, allowing unauthenticated users to attach arbitrary files (bounded to wp-content on current Contact Form 7) to a form's outgoing email via path traversal; when a form is configured to email a copy to a submitter-controlled address, the attacker can read the targeted file.

It is possible to read the advisory at wpscan.com. This vulnerability is uniquely identified as CVE-2026-104246 since 10/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/17/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-103250). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• WordPress Plugin

Name

• Contact Form 7 Signature Addon Plugin

Version

• 4.2.0
• 4.2.1
• 4.2.2

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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