CVE-2025-23963 Overview
CVE-2025-23963 is a missing authorization vulnerability in the flymke Mark Posts WordPress plugin. The flaw affects all versions up to and including 2.2.4. Attackers with low-privileged authenticated access can exploit incorrectly configured access control checks to perform actions outside their permission boundary. The weakness maps to [CWE-862: Missing Authorization]. The issue impacts both integrity and availability of plugin-managed data at a limited scope.
Critical Impact
Authenticated low-privilege users can invoke plugin functionality without proper authorization checks, altering marked-post data.
Affected Products
- flymke Mark Posts plugin for WordPress
- All versions from initial release through 2.2.4
- WordPress sites running the vulnerable mark-posts plugin
Discovery Timeline
- 2025-01-16 - CVE-2025-23963 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-23963
Vulnerability Analysis
The Mark Posts plugin exposes plugin actions without validating whether the requesting user holds the necessary WordPress capability. A missing authorization check allows subscribers or contributors to trigger operations intended for administrators or editors. The vulnerability requires authentication but no user interaction, and it can be exploited remotely over the network. Impact is limited to partial integrity and availability effects on plugin data; confidentiality is not directly affected.
Root Cause
The root cause is [CWE-862: Missing Authorization]. Plugin request handlers fail to call current_user_can() or equivalent capability checks before executing privileged operations. As a result, the plugin relies on the presence of a valid session rather than verifying that the session holds an authorized role. This is a common broken access control pattern in WordPress plugins that expose AJAX or admin-post endpoints.
Attack Vector
An authenticated attacker with a low-privileged account submits a crafted request to the vulnerable plugin endpoint. Because the handler performs no role or capability check, the plugin executes the requested action under the attacker's session. The attacker can modify post markings or plugin configuration data. No exploit code is publicly available at this time, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
See the Patchstack Vulnerability Report for additional technical context.
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Stop Identity AttacksDetection Methods for CVE-2025-23963
Indicators of Compromise
- Unexpected changes to post markings or plugin-managed metadata attributed to non-administrative accounts.
- WordPress access logs showing low-privileged users invoking admin-ajax.php or admin-post.php actions tied to the mark-posts plugin.
- New or modified plugin configuration entries in the wp_options table without corresponding administrator activity.
Detection Strategies
- Audit WordPress activity logs for plugin action requests originating from subscriber, contributor, or author accounts.
- Correlate HTTP request patterns containing mark-posts action parameters with the requesting user's role.
- Review recent modifications to posts and plugin settings against the authenticated user's expected privileges.
Monitoring Recommendations
- Deploy a WordPress activity monitoring plugin that records privileged actions with user role context.
- Enable web server access logging and forward logs to a SIEM for role-based anomaly detection.
- Alert on any non-administrator invocation of plugin management endpoints.
How to Mitigate CVE-2025-23963
Immediate Actions Required
- Update the Mark Posts plugin to a version later than 2.2.4 once a patched release is available from the vendor.
- If no patch is available, deactivate and remove the mark-posts plugin from affected WordPress installations.
- Review user accounts and revoke access for any accounts that do not require it.
Patch Information
The vulnerability affects Mark Posts versions through 2.2.4. Administrators should monitor the Patchstack Vulnerability Report and the plugin's WordPress.org page for a fixed release. Apply updates through the WordPress admin dashboard as soon as a patched version is published.
Workarounds
- Restrict access to /wp-admin/admin-ajax.php and /wp-admin/admin-post.php for low-privileged accounts via a web application firewall (WAF).
- Block requests containing mark-posts action parameters from non-administrative sessions until a patch is deployed.
- Reduce the number of low-privilege accounts on the site and enforce strong authentication to limit exposure.
# Temporarily disable the vulnerable plugin using WP-CLI
wp plugin deactivate mark-posts
wp plugin delete mark-posts
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
