optimole Optimole Plugin up to 4.2.6 on WordPress Link replace_file ID cross-site request forgery

Summaryinfo

A vulnerability classified as problematic was found in optimole Optimole Plugin up to 4.2.6 on WordPress. This affects the function replace_file of the component Link Handler. Such manipulation of the argument ID leads to cross-site request forgery. This vulnerability is documented as CVE-2026-11784. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in optimole Optimole Plugin up to 4.2.6 on WordPress. It has been rated as problematic. Affected by this issue is the function replace_file of the component Link Handler. The manipulation of the argument id with an unknown input leads to a cross-site request forgery vulnerability. Using CWE to declare the problem leads to CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. Impacted is integrity. CVE summarizes:

The Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 4.2.6. This is due to missing or incorrect nonce validation on the replace_file function. This makes it possible for unauthenticated attackers to overwrite existing media attachments with attacker-supplied file content by supplying a forged multipart POST request targeting any attachment the victim has edit_post capability over via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. The forged request requires a victim with at least Author-level privileges, as the handler enforces a current_user_can('edit_post', $id) check; tricking an Author-level or higher user into clicking a crafted link is sufficient to trigger the overwrite against attachments that user can edit.

The weakness was released by Alexandru Bucur. The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-11784 since 06/09/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-37848). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• WordPress Plugin

Vendor

• optimole

Name

• Optimole Plugin

Version

• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4
• 4.2.5
• 4.2.6

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CPE 2.2info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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