CVE-2025-15485: Auto x LINE WordPress Authorization Bypass

CVE-2025-15485 Overview

CVE-2025-15485 affects the Auto x LINE WordPress plugin through version 1.0.0. The plugin exposes several REST API endpoints without authorization checks. Unauthenticated attackers can invoke these endpoints over the network to modify plugin settings and clear activity logs.

The weakness is classified as Missing Authorization [CWE-862]. Because the endpoints accept unauthenticated requests, exploitation requires no credentials, no user interaction, and low attack complexity. Site owners running the plugin should assume settings tampering and log destruction are trivially achievable by any remote attacker who can reach the WordPress REST interface.

Critical Impact

Unauthenticated attackers can alter plugin configuration and wipe log data, undermining both operational integrity and forensic visibility.

Affected Products

• Auto x LINE WordPress plugin versions up to and including 1.0.0
• WordPress sites exposing the plugin's REST endpoints to the internet
• Any deployment relying on the plugin's logs for auditing or troubleshooting

Discovery Timeline

• 2026-09-02 - CVE-2025-15485 published to NVD
• 2026-09-02 - Last updated in NVD database

Technical Details for CVE-2025-15485

Vulnerability Analysis

The Auto x LINE plugin registers REST API routes intended for administrative use. These routes omit permission_callback checks (or return true unconditionally), so WordPress accepts requests from any client, including anonymous ones. Attackers reach the vulnerable handlers by issuing standard HTTP requests to the WordPress REST base path.

Once a request is accepted, the handlers execute privileged operations such as writing plugin option values and truncating log storage. Confidentiality impact is high because settings may contain integration secrets exposed through subsequent reads. Integrity impact is limited to plugin state, and availability of the wider site remains intact.

Log clearing is particularly relevant to incident response. Attackers can destroy the audit trail that would otherwise reveal configuration changes, credential rotation, or downstream abuse of the LINE messaging integration.

Root Cause

The root cause is Missing Authorization [CWE-862] in the plugin's REST route registration. Handlers do not verify the caller's capability (for example, manage_options) before executing state-changing logic. Authentication is not enforced at the route level either.

Attack Vector

Exploitation is remote and unauthenticated. An attacker sends crafted HTTP requests to the plugin's REST endpoints under /wp-json/. No token, nonce, or session cookie is required. Automated scanners can identify vulnerable installations by fingerprinting the plugin and probing the exposed routes.

For technical details of the affected endpoints, refer to the WPScan Vulnerability Report.

Detection Methods for CVE-2025-15485

Indicators of Compromise

• Unexpected POST or PUT requests to /wp-json/ routes registered by the Auto x LINE plugin from unauthenticated sources
• Sudden truncation or absence of plugin log entries without a corresponding administrator action
• Unexplained changes to plugin option values in the wp_options table

Detection Strategies

• Review web server and WordPress REST logs for requests to plugin-specific routes lacking authentication headers or valid nonces
• Correlate configuration changes with authenticated administrator sessions; flag changes with no matching session
• Alert on REST calls from IP addresses that have not previously authenticated to the WordPress admin

Monitoring Recommendations

• Enable verbose REST API request logging at the web server or WAF layer
• Baseline normal administrative activity for the plugin and alert on deviations
• Preserve plugin logs off-host so attacker-initiated clears do not remove forensic evidence

How to Mitigate CVE-2025-15485

Immediate Actions Required

• Deactivate the Auto x LINE plugin until a fixed version is available
• Restrict access to /wp-json/ endpoints from untrusted networks using a WAF or reverse proxy
• Rotate any secrets or API tokens stored in the plugin's settings, as they may have been read or modified
• Export current plugin logs to durable storage before further changes

Patch Information

At the time of publication, no vendor-supplied patch is referenced in the NVD entry for versions through 1.0.0. Monitor the WPScan Vulnerability Report and the plugin's official distribution channel for an updated release.

Workarounds

• Block external access to the plugin's REST routes at the WAF, allowing only trusted administrator IP ranges
• Disable the WordPress REST API for unauthenticated users using a hardening plugin or custom filter
• Remove the plugin entirely if the LINE integration is not actively required

# Example WAF rule concept: deny unauthenticated access to plugin REST routes
# Adapt the pattern to your WAF syntax (ModSecurity, Cloudflare, AWS WAF, etc.)
SecRule REQUEST_URI "@rx ^/wp-json/auto-x-line/" \
  "id:1015485,phase:1,deny,status:403,\
   chain,log,msg:'Block unauthenticated Auto x LINE REST access (CVE-2025-15485)'"
  SecRule &REQUEST_HEADERS:Cookie "@eq 0"