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Vulnerability record · CVE-2026-5581 · published 5 August 2026

CVE-2026-5581: Missing authorization vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.66% · top 50.4% CWE-862 · Missing authorization Deferred
9.1CVSS 3.1 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
12 Aug 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References

LinkTags
https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.8/GFMUAddon.class.php#L131
https://plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.8/inc/GFMUHandlePluploader.class.php#L66
https://plugins.trac.wordpress.org/browser/gf-multi-uploader/trunk/GFMUAddon.class.php#L131
https://plugins.trac.wordpress.org/browser/gf-multi-uploader/trunk/inc/GFMUHandlePluploader.class.php#L66
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3501985%40gf-multi-uploader%2Ftrunk&old
https://www.wordfence.com/threat-intel/vulnerabilities/id/16dca898-1a98-4e0b-8f48-dc01ba2dc4e6?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-5581), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.