sh1zen Multi Uploader for Gravity Forms Plugin up to 1.1.8 on WordPress Capability Check plupload_ajax_delete_file improper authorization

Summaryinfo

A vulnerability described as critical has been identified in sh1zen Multi Uploader for Gravity Forms Plugin up to 1.1.8. This issue affects the function plupload_ajax_delete_file of the component Capability Check. Executing a manipulation can lead to improper authorization. The identification of this vulnerability is CVE-2026-5581. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in sh1zen Multi Uploader for Gravity Forms Plugin up to 1.1.8 and classified as critical. This vulnerability affects the function plupload_ajax_delete_file of the component Capability Check. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect integrity, and availability. CVE summarizes:

The Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to unauthorized arbitrary media deletion in all versions up to, and including, 1.1.8. This is due to missing capability checks in the `plupload_ajax_delete_file()` function, which is registered via `wp_ajax_nopriv_gfmu_delete_file`. The nonce intended for CSRF protection is exposed on any public-facing page containing a multi-uploader form field via the `GFMU_options` JavaScript object. This makes it possible for unauthenticated attackers to permanently delete any WordPress media attachment by supplying its attachment ID, potentially leading to complete media library destruction.

The advisory is shared for download at wordfence.com. This vulnerability was named CVE-2026-5581 since 04/04/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/05/2026). The MITRE ATT&CK project declares the attack technique as T1548.002.

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

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Productinfo

Type

• WordPress Plugin

Vendor

• sh1zen

Name

• Multi Uploader for Gravity Forms Plugin

Version

• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5
• 1.1.6
• 1.1.7
• 1.1.8

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