CVE-2026-77003 Overview
CVE-2026-77003 is a broken access control vulnerability in the Content Mask WordPress plugin before version 1.8.5.5. The plugin fails to verify the capability required to publish the post type being created. Users assigned the Contributor role can publish posts and pages without holding the publish_posts or publish_pages capability. The flaw is categorized under [CWE-269: Improper Privilege Management].
Critical Impact
Authenticated users with Contributor-level access can bypass publishing controls and push unreviewed content live on affected WordPress sites.
Affected Products
- Content Mask WordPress plugin versions prior to 1.8.5.5
- WordPress sites permitting Contributor-level accounts
- Any deployment relying on Content Mask for editorial workflow gating
Discovery Timeline
- 2026-08-23 - CVE-2026-77003 published to NVD
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2026-77003
Vulnerability Analysis
The Content Mask plugin exposes a publishing code path that does not validate WordPress capability checks against the current user. WordPress role-based access control expects plugins to call current_user_can() with the appropriate capability (publish_posts, publish_pages) before transitioning a post to the publish status. Content Mask omits this check for the post type being created.
Contributors normally can author drafts but cannot publish them. The missing capability check lets a Contributor issue a request that promotes their own draft to a public post or page. This undermines editorial review gates that WordPress sites rely on for content moderation.
Root Cause
The root cause is improper privilege management [CWE-269]. The plugin handler processes publish operations without invoking a capability check tied to the target post type. WordPress capabilities such as publish_posts and publish_pages exist precisely to separate authoring from publishing, and the plugin bypasses them.
Attack Vector
Exploitation requires an authenticated account with at least Contributor role. The attacker submits a request through the plugin's publishing flow with a post status of publish. Because the handler skips the capability check, WordPress accepts the transition and makes the content publicly visible. No user interaction from an administrator is required.
No verified proof-of-concept code is publicly available. Refer to the WPScan Vulnerability Report for technical detail.
Detection Methods for CVE-2026-77003
Indicators of Compromise
- Posts or pages with a publish status authored by users holding the Contributor role
- Unexpected transitions of draft content to public status without an editor or administrator in the audit trail
- Web server access logs showing Contributor accounts issuing POST requests to plugin endpoints with post_status=publish
Detection Strategies
- Query the wp_posts table for published entries where post_author maps to a user whose role is Contributor.
- Correlate WordPress audit log entries for transition_post_status events initiated by non-privileged accounts.
- Review installed plugin versions and flag Content Mask installations below 1.8.5.5.
Monitoring Recommendations
- Enable a WordPress activity log plugin to record role, capability, and post status changes.
- Alert on any publish event where the acting user lacks the publish_posts capability.
- Monitor for creation of new Contributor accounts followed by publish activity within a short interval.
How to Mitigate CVE-2026-77003
Immediate Actions Required
- Update the Content Mask plugin to version 1.8.5.5 or later on all WordPress installations.
- Audit existing published posts and pages for unauthorized content created by Contributor accounts.
- Review the current user roster and remove or downgrade unnecessary Contributor accounts.
Patch Information
The vendor addressed the issue in Content Mask version 1.8.5.5 by enforcing the capability check for the target post type. See the WPScan Vulnerability Report for advisory details.
Workarounds
- Temporarily deactivate the Content Mask plugin until patching is complete.
- Restrict Contributor role assignments and require editorial approval workflows enforced outside the plugin.
- Apply a web application firewall rule to block publish transitions from accounts lacking publish capabilities.
# Configuration example: verify installed plugin version via WP-CLI
wp plugin get content-mask --field=version
wp plugin update content-mask --version=1.8.5.5
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
