What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
MailerPress versions 1.5.0 and earlier lack proper authorization checks, allowing unauthenticated attackers to modify data on the site. The vulnerability requires only network access and no user interaction. An attacker can alter information without needing valid credentials or victim interaction.
What an attacker can do
03Attacker Capabilities
Modify site data without authentication or user interaction.
Potential impact on your site
04Site Impact
Unauthorized changes to site content or settings without any warning or audit trail.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
Key dates
06Disclosure timeline
July 31, 2026
CVE published
