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.
Published: 2026-07-31
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The MailerPress plugin contains a missing authorization flaw that allows an unauthenticated attacker to overwrite a campaign’s HTML content by triggering the restoreRevision() function through a REST endpoint. This flaw enables the attacker to select any prior revision and restore it, effectively modifying the campaign’s content without permission. The weakness is a classic example of Missing Authorization (CWE‑862).

Affected Systems

WordPress sites that have MailerPress version 1.5.0 or earlier installed are vulnerable. No other versions are affected according to the current CNA data.

Risk and Exploitability

The CVSS score of 5.3 indicates moderate severity, while the EPSS score of less than 1% suggests a low probability of exploitation at this time. The vulnerability is not listed in CISA’s KEV catalog. Attackers can exploit the flaw by issuing an unauthenticated POST request to /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revision_id> on the target site, making the attack straightforward and requiring no special permissions or additional tools.

Generated by OpenCVE AI on August 2, 2026 at 04:20 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade MailerPress to a version newer than 1.5.0 where the restore endpoint enforces proper authenticationChecks
  • If upgrading is not immediately possible, disable the campaign revision restore endpoint by adding a permission callback that returns false for unauthenticated requests or by removing the route entirely
  • Implement a site‑wide firewall rule or security plugin restriction that blocks unauthenticated access to any /wp-json/mailpress/ REST endpoints

Generated by OpenCVE AI on August 2, 2026 at 04:20 UTC.

Tracking

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Advisories

No advisories yet.

History

Sun, 02 Aug 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Mailerpress
Mailerpress mailerpress – Newsletter, Email Marketing & Ai Automation
Wordpress
Wordpress wordpress
Vendors & Products Mailerpress
Mailerpress mailerpress – Newsletter, Email Marketing & Ai Automation
Wordpress
Wordpress wordpress

Fri, 31 Jul 2026 11:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 31 Jul 2026 09:30:00 +0000

Type Values Removed Values Added
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.
Title MailerPress <= 1.5.0 - Missing Authorization to Unauthenticated Arbitrary Modification via REST API Endpoint
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Subscriptions

Mailerpress Mailerpress – Newsletter, Email Marketing & Ai Automation
Wordpress Wordpress
cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-07-31T10:53:34.281Z

Reserved: 2026-07-30T20:11:46.469Z

Link: CVE-2026-18436

cve-icon Vulnrichment

Updated: 2026-07-31T10:50:28.692Z

cve-icon NVD

Status : Deferred

Published: 2026-07-31T10:16:45.020

Modified: 2026-08-12T21:00:37.147

Link: CVE-2026-18436

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-02T20:32:59Z

Weaknesses