CVE-2025-30581: Top Bar Plugin Authorization Bypass Flaw

CVE-2025-30581 Overview

CVE-2025-30581 is a Missing Authorization vulnerability [CWE-862] affecting the PluginOps Top Bar plugin (ultimate-bar) for WordPress. The flaw exists in versions up to and including 3.3. Attackers can exploit incorrectly configured access control security levels to interact with plugin functionality that should be restricted. The issue is remotely exploitable over the network without authentication or user interaction. Successful exploitation can lead to unauthorized disclosure of low-sensitivity information handled by the plugin.

Critical Impact
Unauthenticated remote attackers can bypass access controls in the Top Bar WordPress plugin to interact with functionality intended for privileged users.

Affected Products

PluginOps Top Bar (ultimate-bar) WordPress plugin — versions through 3.3
WordPress sites with the Top Bar plugin installed and activated
Any site administrator relying on the plugin's default access control configuration

Discovery Timeline

2025-03-24 - CVE-2025-30581 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-30581

Vulnerability Analysis

The vulnerability stems from a Missing Authorization weakness [CWE-862] in the Top Bar WordPress plugin. The plugin exposes functionality without verifying that the requesting user holds the required capability or role. This class of flaw commonly appears in WordPress plugins when action handlers, AJAX endpoints, or REST routes omit a current_user_can() capability check or rely solely on nonce validation.

An unauthenticated attacker can send crafted HTTP requests to the affected endpoints. Because authorization is not enforced, the plugin processes the request as if it originated from an authorized user. The impact is limited to confidentiality of low-sensitivity data, with no direct integrity or availability impact according to the CVSS assessment.

Root Cause

The root cause is Broken Access Control. Plugin code paths responsible for reading or acting on plugin data do not validate the caller's authorization level before executing. WordPress action hooks such as admin_post_, wp_ajax_nopriv_, or REST callbacks require explicit permission callbacks. When those checks are missing or misconfigured, functionality intended for administrators becomes accessible to anonymous visitors.

Attack Vector

Exploitation requires network access to the target WordPress site. The attacker crafts HTTP requests to the vulnerable plugin endpoint, targeting the action or route that lacks a permission check. No credentials, tokens, or user interaction are needed. See the Patchstack WordPress Vulnerability advisory for additional technical details.

// No verified public exploit code is available for CVE-2025-30581.
// Refer to the Patchstack advisory linked above for technical details.

Detection Methods for CVE-2025-30581

Indicators of Compromise

Unauthenticated HTTP POST or GET requests to /wp-admin/admin-ajax.php or /wp-json/ endpoints associated with the ultimate-bar plugin
Requests to plugin action handlers originating from IP addresses not associated with legitimate administrators
Unexpected changes to Top Bar plugin configuration or content without corresponding administrator login events

Detection Strategies

Inventory WordPress installations to identify any site running the Top Bar (ultimate-bar) plugin at version 3.3 or earlier
Review web server access logs for anomalous request patterns targeting the plugin's AJAX or REST endpoints
Correlate WordPress audit logs to identify actions on plugin functionality that occurred without a matching authenticated session

Monitoring Recommendations

Enable WordPress activity logging to record plugin configuration changes and endpoint invocations
Alert on high-volume or scripted access to admin-ajax.php from unauthenticated sources
Monitor for outbound requests or content changes on pages managed by the Top Bar plugin

How to Mitigate CVE-2025-30581

Immediate Actions Required

Identify all WordPress sites running the Top Bar plugin at version 3.3 or earlier and prioritize them for remediation
Update the plugin to a version above 3.3 once the vendor publishes a fix, per the Patchstack advisory
Deactivate and remove the plugin if it is not required for site operations

Patch Information

A fixed release beyond version 3.3 should be applied when available from PluginOps. Consult the Patchstack advisory referenced in the external references for current patch status and virtual patching options available through Patchstack's mitigation service.

Workarounds

Restrict access to wp-admin/admin-ajax.php and REST API routes using a web application firewall (WAF) rule that blocks unauthenticated calls to ultimate-bar actions
Deactivate the Top Bar plugin until a patched version is installed
Apply Patchstack or an equivalent virtual patching layer to filter malicious requests targeting the vulnerable endpoint

bash

# Example WAF rule concept to block unauthenticated calls to the plugin's AJAX action
# Adapt to your WAF syntax (ModSecurity, Cloudflare, etc.)
SecRule REQUEST_URI "@contains /wp-admin/admin-ajax.php" \
  "chain,deny,status:403,id:1030581,msg:'Block unauthenticated ultimate-bar action'"
SecRule ARGS:action "@rx ^(ultimate_bar|top_bar)_" \
  "chain"
SecRule &REQUEST_COOKIES:wordpress_logged_in "@eq 0"