CVE-2025-62977: Baiduseo Auth Bypass Vulnerability

CVE-2025-62977 Overview

CVE-2025-62977 is a missing authorization vulnerability [CWE-862] in the 沃之涛 baiduseo WordPress plugin, also known as 百度站长SEO合集 (supporting Baidu, Shenma, Bing, and Toutiao push). The plugin exposes functionality that is not properly constrained by access control lists (ACLs). Unauthenticated attackers can reach plugin actions over the network without user interaction. The flaw affects all versions from initial release through 2.1.4. Impact is limited to integrity, with no confidentiality or availability loss according to the published CVSS vector.

Critical Impact
Unauthenticated attackers can invoke plugin functionality intended for privileged users, altering SEO push behavior on affected WordPress sites.

Affected Products

沃之涛百度站长SEO合集 (baiduseo) WordPress plugin, versions up to and including 2.1.4
WordPress sites running the affected plugin with public network reachability
Sites integrating Baidu, Shenma, Bing, or Toutiao search push through this plugin

Discovery Timeline

2025-10-27 - CVE-2025-62977 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-62977

Vulnerability Analysis

The baiduseo plugin exposes one or more request handlers without verifying the caller's capability or nonce. This allows any network-based requester to trigger administrative-style functionality. The CWE-862 classification confirms that the code path lacks an authorization check that should have been present before executing a sensitive action. Because the attack requires no privileges and no user interaction, exploitation can be automated at scale against exposed WordPress installations.

Root Cause

The root cause is a missing authorization check on plugin endpoints, typically WordPress AJAX or admin-post handlers registered by the plugin. Handlers should call current_user_can() and validate a wp_verify_nonce() token before executing. The affected versions omit these checks, allowing arbitrary callers to reach protected code paths.

Attack Vector

An attacker sends a crafted HTTP request to the vulnerable plugin endpoint on a target WordPress site. No authentication header, session cookie, or user interaction is required. The server processes the request and executes the underlying plugin action, resulting in unauthorized modification of SEO push configuration or triggered submissions. See the Patchstack advisory for additional technical detail.

No verified proof-of-concept code is publicly linked from the NVD entry. The vulnerability class corresponds to a standard WordPress broken access control pattern in admin-ajax.php or admin-post.php handlers.

Detection Methods for CVE-2025-62977

Indicators of Compromise

Unexpected outbound push requests from WordPress to Baidu, Shenma, Bing, or Toutiao APIs
HTTP requests to wp-admin/admin-ajax.php or wp-admin/admin-post.php with baiduseo-related action parameters from unauthenticated sources
Unauthorized modifications to plugin option rows in wp_options referencing baiduseo settings
Access log entries showing anonymous POST requests hitting plugin endpoints followed by HTTP 200 responses

Detection Strategies

Inventory WordPress installations and flag any running baiduseo at version 2.1.4 or earlier
Alert on admin-ajax.php POST requests carrying baiduseo action names without an authenticated session cookie
Compare current plugin configuration against a known-good baseline to identify unauthorized changes

Monitoring Recommendations

Forward WordPress access logs and wp_options change events to a centralized log platform for correlation
Track anomalous outbound traffic to search engine push endpoints originating from web servers
Enable file integrity monitoring on the wp-content/plugins/baiduseo/ directory

How to Mitigate CVE-2025-62977

Immediate Actions Required

Update the baiduseo plugin to a version later than 2.1.4 once released by the vendor
If no fixed version is available, deactivate and remove the plugin from all WordPress installations
Rotate any API tokens the plugin stored for Baidu, Shenma, Bing, or Toutiao push integrations
Review WordPress and plugin configuration for unauthorized changes made while the vulnerability was exposed

Patch Information

At the time of NVD publication, the advisory lists all versions through 2.1.4 as affected. Refer to the Patchstack advisory for baiduseo for the current patched version and vendor guidance.

Workarounds

Restrict access to wp-admin/admin-ajax.php and wp-admin/admin-post.php at the web application firewall using request signatures targeting baiduseo actions
Block unauthenticated POST requests to plugin endpoints via server-level rules until a patch is applied
Place the WordPress admin surface behind IP allowlisting where operationally feasible

bash

# Example WAF rule (ModSecurity) blocking anonymous baiduseo action calls
SecRule REQUEST_URI "@rx /wp-admin/admin-(ajax|post)\.php" \
  "chain,phase:2,deny,status:403,id:1620977,\
   msg:'CVE-2025-62977 baiduseo unauthenticated action'"
  SecRule ARGS:action "@rx ^baiduseo_" \
    "chain"
    SecRule &REQUEST_COOKIES:/wordpress_logged_in_/ "@eq 0"