# CVE-2026-11784: Optimole WordPress Plugin CSRF in replace_file function

Source: https://junglewise.ai/threats/cve-2026-11784-optimole-wordpress-plugin-csrf-in-replace-file-function  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-18. Updated: 2026-06-20  
License: CC BY 4.0 with a link back

CVE-2026-11784 · Severity: medium · CVSS 4.3 · Published 2026-06-18

The Optimole plugin for WordPress, which is used to optimize images and improve website performance, contains a security flaw that could allow an attacker to replace existing website images with their own content. To exploit this, an attacker must trick a site administrator or author into clicking a malicious link while they are logged in. This could lead to unauthorized content changes or website defacement.

Technologies: [Optimole](https://junglewise.ai/threats/technologies/optimole). Vendors: [Optimole](https://junglewise.ai/threats/vendors/optimole).

## Quick answers

**Is CVE-2026-11784 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-11784 being exploited in the wild.

**How severe is CVE-2026-11784?** Medium severity, with a CVSS score of 4.3, published 18 June 2026.

**Which products and versions are affected?** Optimole <= 4.2.6.

**Is there a fix for CVE-2026-11784?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-11784 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-11784?** Check whether you run Optimole at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Optimole plugin for WordPress is vulnerable to Cross-Site Request Forgery (CSRF) in all versions up to and including 4.2.6 due to missing or incorrect nonce validation on the replace_file function. An unauthenticated attacker can exploit this by tricking a user with 'Author' level privileges or higher into clicking a crafted link. Upon execution, the forged multipart POST request can overwrite existing media attachments that the victim has permission to edit. The vulnerability is mitigated by a 'current_user_can' check, which limits the impact to attachments the logged-in victim is authorized to modify.

## Affected products

- Optimole Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization <= 4.2.6

## Timeline

- 2026-06-18: disclosed
- 2026-06-18: advisory

## References

- [https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.5/inc/media_rename/attachment_edit.php](https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.5/inc/media_rename/attachment_edit.php)
- [https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.5/inc/media_rename/attachment_edit.php](https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.5/inc/media_rename/attachment_edit.php)
- [https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.6/inc/media_rename/attachment_edit.php](https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.6/inc/media_rename/attachment_edit.php)
- [https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.6/inc/media_rename/attachment_edit.php](https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.6/inc/media_rename/attachment_edit.php)
- [https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3574315%40optimole-wp&new=3574315%40optimole-wp&sfp_email=&sfph_mail=](https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3574315%40optimole-wp&new=3574315%40optimole-wp&sfp_email=&sfph_mail=)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/8a90de6e-6bd5-43b6-980d-84d25d4120ad?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/8a90de6e-6bd5-43b6-980d-84d25d4120ad?source=cve)

## Related threats

- [Optimole broken access control in WordPress plugin](https://junglewise.ai/threats/cve-2026-102375-subscriber-broken-access-control-in-optimole-4-2-14-versions)
- [Optimole Stored Cross-Site Scripting in image tag attributes](https://junglewise.ai/threats/cve-2026-84829-optimole-stored-cross-site-scripting-in-image-tag-attributes)
- [Optimole WordPress plugin unauthenticated XSS](https://junglewise.ai/threats/cve-2026-57673-optimole-wordpress-plugin-unauthenticated-xss)