CVE-2026-18436
Received Received - Intake

MailPress WordPress Plugin Unauthorized Campaign Content Modification via Revision Restore

Publication date: 2026-07-31

Last updated on: 2026-07-31

Assigner: Wordfence

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.

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Meta Information

Published
2026-07-31
Last Modified
2026-07-31
Generated
2026-07-31
AI Q&A
2026-07-31
EPSS Evaluated
N/A
NVD
CVE-2026-18436
EUVD
EUVD-2026-51507

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mailpress mailpress to 1.5.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

The MailPress WordPress plugin up to version 1.5.0 has an unauthorized access vulnerability via the campaign revision-restore REST endpoint. The endpoint allows unauthenticated users to restore old revisions of a campaign, overwriting its current content with arbitrary prior revisions.

Detection Guidance

Check WordPress sites running MailPress plugin versions up to 1.5.0 for unauthorized POST requests to /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revision_id>. Monitor logs for suspicious REST API activity targeting this endpoint.

Impact Analysis

Unauthenticated attackers could modify campaign content by restoring old revisions, potentially altering messages sent to subscribers without detection. This could lead to misinformation, phishing, or reputational damage if campaigns are altered.

Compliance Impact

This vulnerability could impact compliance by allowing unauthorized changes to campaign content, potentially violating data integrity requirements in GDPR or HIPAA. Unauthorized modifications may also lead to breaches of confidentiality if sensitive campaign data is altered.

Mitigation Strategies

Update MailPress plugin to the latest version beyond 1.5.0. If an update is unavailable, disable the plugin immediately. Review campaign revisions for unauthorized changes and restrict access to WordPress REST API endpoints.

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