Vulnerabilities / Smush – Lazy Load Images, Optimize & Compress Images / WPSEC-2026-2386
Smush – Lazy Load Images, Optimize & Compress Images <= 4.3.5 - Authenticated (Author+) Insecure Direct Object Reference to Arbitrary Attachment Optimization, Restoration and Ignore Status Modification
Medium 4.3
CWE-639Fixed in 4.3.6
- ID
- WPSEC-2026-2386
- Plugin
- Smush – Image Optimization, Compression, Lazy Load, WebP & CDN (wp-smushit)
- Affected
- all versions before 4.3.6
- Remediation
- Update to 4.3.6 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-639
- Usage
- Plugin High · Affected versions High among sites WPSec scans, 2026-11-03
- Attack surface
- Smush – Lazy Load Images, Optimize & Compress Images on WPSec AttackSurface
- Fix released
- Published
Description
The Smush plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 4.3.5 due to missing per-attachment authorization checks in the AJAX single image optimization, backup restore and ignore/unignore handlers and in the media library bulk restore action, which only verified the generic 'upload_files' capability. This makes it possible for authenticated attackers, with Author-level access and above, to optimize, restore original backups of, or change the ignored status of attachments belonging to other users that they are not allowed to edit.
References
- https://wpsec.com/vuln/WPSEC-2026-2386/
- https://plugins.svn.wordpress.org/wp-smushit/tags/4.3.6/
- https://wordpress.org/plugins/wp-smushit/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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