Multi Uploader for Gravity Forms <= 1.1.8 - Missing Authorization to Unauthenticated Arbitrary Media Deletion
Strategic Overview
- Status
- Patched in 1.1.9
- Affected Plugin
- Multi Uploader for Gravity Forms
- Affected Version
<= 1.1.8- CVSS
- 9.1Critical
- Weakness type
- CWE-862 · Missing Authorization
- CVE
CVE-2026-5581
At a glance
CVE-2026-5581 is a critical-severity Missing Authorization vulnerability in the Multi Uploader for Gravity Forms WordPress plugin, affecting versions <= 1.1.8. It carries a CVSS score of 9.1 (reachable over the network; low attack complexity; high integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 1.1.9; sites on affected versions should update now. Disclosed August 2026, reported by Riski Gana Prasetya.
Vulnerability Overview
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.
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 integrity, availability.
CWE-862: Missing Authorization
Multi Uploader for Gravity Forms <= 1.1.8 carries this weakness at plupload_ajax_delete_file(), and reaching it takes no account at all. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.
Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Multi Uploader for Gravity Forms the fix is 1.1.9: builds <= 1.1.8 are affected, anything from 1.1.9 onward is not.
Remediation
Update to version 1.1.9, or a newer patched version
How WordSec helps
This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Multi Uploader for Gravity Forms 1.1.9 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Multi Uploader for Gravity Forms
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C