CVE-2025-23670: 4 Author Cheer Up Donate XSS Flaw

CVE-2025-23670 Overview

CVE-2025-23670 is a reflected cross-site scripting (XSS) vulnerability in the 4 author cheer up donate WordPress plugin developed by montashov. The flaw affects all versions up to and including 1.3. The plugin fails to properly neutralize user-supplied input during web page generation, allowing attackers to inject malicious scripts that execute in a victim's browser. The vulnerability is classified under CWE-79 and requires user interaction to trigger. Successful exploitation can compromise session tokens, redirect users to malicious sites, or perform actions on behalf of authenticated users.

Critical Impact

Attackers can execute arbitrary JavaScript in the context of any user who clicks a crafted link, leading to account takeover, credential theft, and unauthorized administrative actions on affected WordPress sites.

Affected Products

• WordPress plugin 4-author-cheer-up-donate by montashov
• All versions from n/a through 1.3 (inclusive)
• WordPress sites running the vulnerable plugin

Discovery Timeline

• 2025-03-03 - CVE-2025-23670 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-23670

Vulnerability Analysis

The vulnerability stems from improper neutralization of user-controlled input that is reflected back into HTTP responses. When the plugin processes request parameters, it embeds the unsanitized values directly into the rendered HTML page. An attacker can craft a malicious URL containing JavaScript payloads in vulnerable parameters. When a victim clicks the link, the payload executes in their browser within the trust context of the WordPress site.

The scope-changed nature of this issue means script execution can affect resources beyond the initially vulnerable component. Attackers can leverage this to steal authentication cookies, exfiltrate sensitive page data, or pivot to administrative functions if the victim holds elevated privileges. The EPSS score of 0.232% reflects current exploitation likelihood, though public WordPress plugins remain frequent targets for automated scanning.

Root Cause

The root cause is missing output encoding and input sanitization in the plugin's request-handling logic. WordPress provides functions such as esc_html(), esc_attr(), and sanitize_text_field() for safe output rendering, but the plugin code does not apply these escaping routines before echoing user input. This omission permits HTML and JavaScript injection through reflected parameters.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker delivers a crafted URL through phishing, social engineering, or compromised third-party sites. Authentication is not required to construct the payload, but the impact scales with the victim's privilege level on the target WordPress installation. See the Patchstack XSS Vulnerability Advisory for additional technical details.

The vulnerability manifests when unsanitized request parameters are reflected into the response body. No verified proof-of-concept code is publicly available, but the pattern follows standard reflected XSS exploitation techniques against WordPress plugins.

Detection Methods for CVE-2025-23670

Indicators of Compromise

• HTTP requests containing <script>, javascript:, or HTML event handler payloads in query parameters targeting plugin endpoints
• Unexpected outbound connections from administrator browsers to attacker-controlled domains following plugin URL access
• Suspicious session activity, including new administrator accounts or modified plugin settings without corresponding audit log entries
• WordPress access logs showing URL-encoded JavaScript payloads directed at 4-author-cheer-up-donate plugin paths

Detection Strategies

• Deploy web application firewall (WAF) rules matching reflected XSS patterns against plugin request parameters
• Inspect WordPress access logs for encoded characters such as %3Cscript%3E, %3Cimg, or onerror= in GET requests
• Monitor for browser-side Content Security Policy (CSP) violation reports originating from WordPress administrator sessions
• Correlate phishing email telemetry with subsequent access to vulnerable plugin URLs from internal users

Monitoring Recommendations

• Enable verbose logging on the WordPress site, including request body and query string capture
• Forward web server logs to a centralized SIEM for pattern analysis and alert correlation
• Track plugin version inventory across all WordPress instances to identify exposure
• Alert on administrator account creation, role changes, or plugin installation events outside maintenance windows

How to Mitigate CVE-2025-23670

Immediate Actions Required

• Disable the 4 author cheer up donate plugin until a patched version is verified available from the vendor
• Restrict WordPress administrator access to trusted networks using IP allowlisting where feasible
• Force password resets and session invalidation for all administrator accounts on affected sites
• Review WordPress audit logs for evidence of unauthorized configuration changes or account modifications

Patch Information

At the time of publication, no fixed version is listed in the NVD record. The vulnerability affects all versions through 1.3. Site administrators should monitor the Patchstack advisory and the WordPress plugin repository for updates. If no patch is forthcoming, consider permanent removal of the plugin.

Workarounds

• Remove or deactivate the vulnerable plugin entirely if it is not business-critical
• Implement a strict Content Security Policy (CSP) header to limit inline script execution
• Deploy a WAF with WordPress-specific rulesets to block reflected XSS payloads at the perimeter
• Educate administrators and editors to avoid clicking unsolicited links referencing the WordPress admin interface

# Example NGINX configuration to enforce Content Security Policy
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none';" always;
add_header X-XSS-Protection "1; mode=block" always;
add_header X-Content-Type-Options "nosniff" always;