CVE-2025-31457: LWS SMS Plugin CSRF Vulnerability

CVE-2025-31457 Overview

CVE-2025-31457 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the LWS SMS WordPress plugin developed by Aurélien LWS. The flaw exists in all versions of lws-sms up to and including 2.4.1. An attacker can craft a malicious web page that, when visited by an authenticated administrator, triggers unintended state-changing actions in the plugin. The vulnerability is tracked under CWE-352: Cross-Site Request Forgery and requires user interaction to succeed. Successful exploitation can compromise plugin integrity and availability without any direct network authentication by the attacker.

Critical Impact
An authenticated administrator visiting an attacker-controlled page can be forced to execute unauthorized actions in the LWS SMS plugin, altering configuration or SMS-related functionality.

Affected Products

LWS SMS WordPress plugin (lws-sms) versions through 2.4.1
WordPress sites with the LWS SMS plugin installed and active
Any WordPress administrator session authenticated to a site running vulnerable versions

Discovery Timeline

2025-03-28 - CVE-2025-31457 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31457

Vulnerability Analysis

The LWS SMS plugin fails to enforce anti-CSRF protections on one or more state-changing request handlers. WordPress provides nonce primitives such as wp_nonce_field() and check_admin_referer() to bind sensitive actions to authenticated user sessions. When these mechanisms are absent, the browser attaches session cookies to any cross-origin request the attacker induces, satisfying the plugin's authorization checks. The result is that an attacker can trigger administrator-privileged actions without ever stealing credentials.

The attack requires user interaction, meaning the target administrator must load an attacker-controlled resource such as a malicious link, an embedded iframe, or an auto-submitting form. Because the request originates from the authenticated user's browser, server-side logic treats it as legitimate. Impact is limited to integrity and availability of plugin data and configuration, with no direct confidentiality loss.

Root Cause

The root cause is missing or improperly validated CSRF tokens on privileged actions exposed by the lws-sms plugin. Requests are accepted based solely on session cookies, without verifying that the request was intentionally initiated from the plugin's own administrative interface.

Attack Vector

Exploitation occurs over the network and requires social engineering to lure an authenticated administrator to a hostile page. The attacker crafts an HTML form or JavaScript payload that submits a POST request to the vulnerable plugin endpoint. The victim's browser automatically includes the WordPress session cookie, and the server processes the forged action as though the administrator had initiated it.

See the Patchstack WordPress Vulnerability Report for further technical detail. No public proof-of-concept or exploit code is available at this time.

Detection Methods for CVE-2025-31457

Indicators of Compromise

Unexpected changes to LWS SMS plugin configuration, API keys, or sender identities in the WordPress admin area
Unexplained outbound SMS traffic or logs showing messages sent without corresponding administrator activity
HTTP POST requests to lws-sms admin-ajax or admin-post endpoints with Referer headers pointing to external, unrelated domains

Detection Strategies

Monitor WordPress access logs for state-changing requests to plugin endpoints where the Referer or Origin header does not match the site's own domain
Correlate administrator authentication events with subsequent plugin configuration changes to identify suspicious sequences
Deploy a web application firewall (WAF) rule set that flags cross-origin form submissions targeting known WordPress plugin paths

Monitoring Recommendations

Enable WordPress audit logging for all plugin option updates and administrative actions
Alert on modifications to LWS SMS settings outside of scheduled maintenance windows
Track browser-based administrator sessions accessing unfamiliar third-party sites immediately before plugin configuration changes

How to Mitigate CVE-2025-31457

Immediate Actions Required

Update the LWS SMS plugin to a version later than 2.4.1 once the vendor releases a patched build
Audit recent LWS SMS configuration and SMS delivery logs for unauthorized modifications
Instruct WordPress administrators to log out of admin sessions when not actively working in the dashboard

Patch Information

At the time of publication, the vulnerability affects LWS SMS through version 2.4.1. Administrators should consult the Patchstack advisory for the latest fixed version information and apply updates through the WordPress plugin manager.

Workarounds

Deactivate and remove the LWS SMS plugin until a fixed version is installed if SMS functionality is not business-critical
Restrict WordPress administrator access to dedicated browser profiles that do not visit untrusted external sites
Deploy a WAF rule enforcing SameSite=Strict cookie behavior or blocking cross-origin POST requests to wp-admin/ paths

bash

# Example WAF rule concept - block cross-origin POSTs to lws-sms endpoints
# Adjust to your WAF syntax (ModSecurity example)
SecRule REQUEST_METHOD "@streq POST" \
  "chain,phase:1,deny,status:403,id:1003145,msg:'Blocked cross-origin POST to lws-sms'"
  SecRule REQUEST_URI "@rx /wp-admin/(admin-ajax|admin-post)\.php" \
    "chain"
    SecRule ARGS:action "@rx ^lws[_-]sms" \
      "chain"
      SecRule REQUEST_HEADERS:Origin "!@rx ^https?://your-site\.example($|/)"