Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/mailerpress/trunk/src/Api/CampaignRev
- https://plugins.trac.wordpress.org/browser/mailerpress/trunk/src/Api/CampaignRev
- https://www.wordfence.com/threat-intel/vulnerabilities/id/793a7ef0-8938-47a6-80e
FAQ
What is CVE-2026-18436?
CVE-2026-18436 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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...
How severe is CVE-2026-18436?
CVE-2026-18436 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-18436?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.