wpmessiah Swiss Toolkit for WP Plugin up to 1.4.6 on WordPress File Upload upload_extension_files filename unrestricted upload

Summaryinfo

A vulnerability marked as critical has been reported in wpmessiah Swiss Toolkit for WP Plugin up to 1.4.6. Impacted is the function upload_extension_files of the component File Upload. Performing a manipulation of the argument filename results in unrestricted upload. This vulnerability is known as CVE-2026-2354. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in wpmessiah Swiss Toolkit for WP Plugin up to 1.4.6. It has been classified as critical. This affects the function upload_extension_files of the component File Upload. The manipulation of the argument filename with an unknown input leads to a unrestricted upload vulnerability. CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The Swiss Toolkit For WP plugin for WordPress is vulnerable to arbitrary file upload due to a flawed file type validation bypass in the `upload_extension_files()` function in all versions up to, and including, 1.4.6. The `upload_extension_files()` function hooks into WordPress's `wp_check_filetype_and_ext` filter and uses `strpos()` to check if a filename contains a configured extension string, rather than verifying the actual file extension. This makes it possible for authenticated attackers, with Author-level access and above, to upload arbitrary files (including PHP) on the affected site's server which may make remote code execution possible, granted the "Enhanced Multi-Format Image Support" feature is enabled with at least one extension (e.g., avif) in the allowed formats.

The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2026-2354 since 02/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/11/2026). MITRE ATT&CK project uses the attack technique T1608.002 for this issue.

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• wpmessiah

Name

• Swiss Toolkit for WP Plugin

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.4.6

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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