CVE-2025-48285: Falang Multilanguage CSRF Vulnerability

CVE-2025-48285 Overview

CVE-2025-48285 is a Cross-Site Request Forgery (CSRF) vulnerability in the sbouey Falang multilanguage WordPress plugin. The flaw affects all versions from initial release through 1.3.61. The vulnerability is tracked under CWE-352 and stems from missing anti-CSRF token validation on state-changing plugin actions.

An attacker can craft a malicious web page that triggers unauthorized actions when an authenticated WordPress user visits it. Exploitation requires user interaction, but no privileges on the target site. The scope is limited to integrity impact on the plugin's translation data.

Critical Impact
Attackers can force authenticated WordPress administrators to perform unintended state-changing actions in the Falang plugin, resulting in unauthorized modification of multilanguage content.

Affected Products

sbouey Falang multilanguage WordPress plugin, versions through 1.3.61
WordPress sites running the vulnerable Falang plugin build
Administrator sessions authenticated to affected WordPress installations

Discovery Timeline

2025-05-19 - CVE-2025-48285 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-48285

Vulnerability Analysis

The Falang multilanguage plugin exposes administrative endpoints that mutate plugin state without verifying WordPress nonce tokens. WordPress ships a built-in nonce mechanism (wp_nonce_field, check_admin_referer, wp_verify_nonce) intended to bind sensitive requests to the authenticated user's session. When these checks are missing, the browser will automatically attach authentication cookies to any request an attacker triggers cross-origin.

The CVSS vector indicates the attack traverses the network, requires user interaction, and impacts integrity only. Confidentiality and availability are not directly affected. The EPSS score is 0.128%, placing exploitation probability in the lower percentile range for public CVEs.

Root Cause

The root cause is missing CSRF protection ([CWE-352]) on one or more administrative request handlers within the Falang plugin. State-changing operations do not require a valid nonce or referrer check before executing. As a result, the plugin trusts the presence of a valid authentication cookie as sufficient authorization for the action.

Attack Vector

An attacker hosts a malicious page containing an auto-submitting HTML form or crafted image tag targeting a vulnerable Falang endpoint. The attacker lures an authenticated WordPress administrator to visit the page through phishing, forum posts, or comments. The victim's browser attaches the WordPress session cookie to the forged request, and the plugin executes the action as the administrator.

Exploitation does not require the attacker to steal credentials or bypass authentication. It requires only that a logged-in administrator interact with attacker-controlled content while a valid session exists. See the Patchstack Vulnerability Advisory for additional technical context.

Detection Methods for CVE-2025-48285

Indicators of Compromise

Unexpected modifications to Falang translation entries, language configurations, or plugin settings without corresponding admin-initiated sessions
HTTP POST requests to Falang plugin admin endpoints originating from external Referer headers
WordPress audit log entries showing administrative actions immediately following external site visits

Detection Strategies

Inspect WordPress access logs for POST requests to /wp-admin/admin.php?page=falang* endpoints missing the _wpnonce parameter
Compare Referer headers on plugin admin requests against the site's own origin and flag cross-origin submissions
Correlate administrator browser activity with sudden Falang configuration changes to identify forged requests

Monitoring Recommendations

Enable WordPress audit logging plugins to record all plugin configuration and content changes with user, IP, and timestamp
Monitor for anomalous administrator activity outside expected working hours or from unusual geolocations
Alert on Falang plugin state changes that lack a matching interactive admin session in web server logs

How to Mitigate CVE-2025-48285

Immediate Actions Required

Update the Falang multilanguage plugin to a version released after 1.3.61 that includes CSRF protection
Require administrators to log out of WordPress when not actively managing the site to shrink the exploitation window
Restrict /wp-admin access by IP allowlist at the web server or WAF layer where operationally feasible

Patch Information

Refer to the Patchstack Vulnerability Advisory for the fixed version and vendor guidance. Apply the plugin update through the WordPress admin dashboard or via WP-CLI. Verify the installed version after the update completes.

Workarounds

Deploy a web application firewall rule that blocks POST requests to Falang admin endpoints when the Referer header does not match the site's own domain
Enforce SameSite=Lax or SameSite=Strict cookie attributes on the WordPress authentication cookie to reduce cross-site cookie attachment
Disable or remove the Falang plugin until the patched version can be deployed if the plugin is not actively required

bash

# Update Falang plugin via WP-CLI
wp plugin update falang
wp plugin get falang --field=version

# Optional: enforce SameSite on auth cookies via web server header
# Nginx example
add_header Set-Cookie "Path=/; HttpOnly; Secure; SameSite=Lax";