CVE-2025-32116: QR Master Plugin XSS Vulnerability

CVE-2025-32116 Overview

CVE-2025-32116 is a reflected cross-site scripting (XSS) vulnerability in the Studi7 QR Master WordPress plugin. The flaw stems from improper neutralization of user input during web page generation [CWE-79]. All versions of QR Master up to and including 1.0.5 are affected. An unauthenticated attacker can craft a malicious URL that, when clicked by a victim, executes attacker-controlled JavaScript in the victim's browser session. The vulnerability requires user interaction and operates with a scope change, meaning injected scripts can affect resources beyond the vulnerable component. Patchstack catalogued the issue in its WordPress vulnerability database in April 2025.

Critical Impact
Attackers can execute arbitrary JavaScript in a victim's browser, enabling session theft, credential harvesting, and unauthorized actions against WordPress sites running QR Master.

Affected Products

Studi7 QR Master WordPress plugin versions through 1.0.5
WordPress sites with the QR Master plugin installed and active
All deployments where unauthenticated users can reach affected plugin endpoints

Discovery Timeline

2025-04-10 - CVE-2025-32116 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-32116

Vulnerability Analysis

The vulnerability is a reflected cross-site scripting flaw in the QR Master plugin for WordPress. The plugin accepts user-supplied input through request parameters and reflects that input back into rendered HTML without proper encoding or sanitization. When a victim visits a crafted URL, the injected script executes within the security context of the WordPress site.

Reflected XSS attacks are typically delivered through phishing emails or malicious links on third-party sites. Successful exploitation allows attackers to steal authentication cookies, perform actions on behalf of authenticated administrators, redirect users to malicious sites, or deface plugin-rendered content. The scope change indicated by the CVSS vector signals that the injected payload can impact resources managed by a different security authority than the vulnerable component.

Root Cause

The root cause is missing output encoding when the plugin generates HTML responses that include user-controlled request data. The plugin does not apply WordPress sanitization functions such as esc_html(), esc_attr(), or wp_kses() before echoing parameter values into the page response. This omission allows attacker-supplied HTML and JavaScript to be parsed and executed by the victim's browser.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker crafts a URL pointing to a vulnerable QR Master endpoint with a malicious payload embedded in a request parameter. The attacker delivers this URL through phishing, malvertising, or social engineering. When the victim clicks the link, the WordPress site reflects the payload into the response and the browser executes it. No authentication is required to launch the attack.

Refer to the Patchstack WordPress Plugin Advisory for additional technical context.

Detection Methods for CVE-2025-32116

Indicators of Compromise

Web server access logs containing requests to QR Master plugin endpoints with URL-encoded <script>, onerror=, or javascript: payloads in query parameters
Unexpected outbound requests from user browsers to attacker-controlled domains following visits to WordPress pages hosting the plugin
Reports from users describing unexpected redirects, popups, or session anomalies after clicking links referencing the affected site

Detection Strategies

Inspect HTTP request and response pairs for reflected payloads where query string values appear unencoded in the response body
Deploy a web application firewall (WAF) ruleset that flags common XSS payload signatures against requests targeting /wp-content/plugins/qr-master/ paths
Audit installed WordPress plugins to identify QR Master versions at or below 1.0.5

Monitoring Recommendations

Forward WordPress access logs and WAF telemetry into a centralized SIEM for correlation against XSS payload patterns
Enable Content Security Policy (CSP) violation reporting to surface injected script execution attempts
Monitor administrator account activity for anomalous session usage that could indicate cookie theft via XSS

How to Mitigate CVE-2025-32116

Immediate Actions Required

Identify all WordPress installations running the QR Master plugin and inventory the installed version
Deactivate and remove the QR Master plugin if a patched release is not yet available for your environment
Force a rotation of administrator session cookies and review recent admin actions for signs of unauthorized changes

Patch Information

At the time of NVD publication, fixed version information was not enumerated in the advisory. Site operators should consult the Patchstack WordPress Plugin Advisory for the latest fix status and upgrade to any release later than 1.0.5 once published by the vendor.

Workarounds

Deploy WAF rules that block requests containing common XSS payload patterns targeting QR Master endpoints
Implement a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
Restrict access to plugin endpoints at the web server level when the plugin functionality is not required for unauthenticated visitors

bash

# Example nginx rule to block obvious XSS payloads against the plugin path
location ~* /wp-content/plugins/qr-master/ {
    if ($args ~* "(<|%3C)script|javascript:|onerror=") {
        return 403;
    }
}