MailPress Plugin up to 1.5.0 on WordPress Campaign Revision-Restore REST Endpoint campaign restoreRevision privileges management

Summaryinfo

A vulnerability was found in MailPress Plugin up to 1.5.0 and classified as problematic. Impacted is the function restoreRevision of the file /wp-json/mailpress/v1/campaign of the component Campaign Revision-Restore REST Endpoint. Executing a manipulation can lead to privileges management. This vulnerability is registered as CVE-2026-18436. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in MailPress Plugin up to 1.5.0 and classified as problematic. This vulnerability affects the function restoreRevision of the file /wp-json/mailpress/v1/campaign of the component Campaign Revision-Restore REST Endpoint. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect integrity. CVE summarizes:

The MailPress plugin for WordPress is vulnerable to unauthorized access in versions up to, and including, 1.5.0 via the campaign revision-restore REST endpoint (POST /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revision_id>). The route in the vulnerable range was registered without a permissionCallback, allowing the restoreRevision() handler to run for unauthenticated requests and overwrite a campaign's content_html with any prior revision. This makes it possible for unauthenticated attackers to modify campaign content by restoring an arbitrary revision.

The advisory is shared for download at wordfence.com. This vulnerability was named CVE-2026-18436 since 07/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/31/2026). The MITRE ATT&CK project declares the attack technique as T1068.

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-2026-51507). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Name

• MailPress Plugin

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5.0

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Once again VulDB remains the best source for vulnerability data.

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