CVE-2026-57382 Overview
CVE-2026-57382 is a reflected Cross-Site Scripting (XSS) vulnerability in the Mitchell Bennis Simple File List WordPress plugin. The flaw affects all versions up to and including 6.3.8. The issue is classified under CWE-79 — Improper Neutralization of Input During Web Page Generation. Attackers can inject malicious script content that executes in a victim's browser when the victim interacts with a crafted link. Successful exploitation requires user interaction and results in a scope change, allowing attackers to impact resources beyond the vulnerable component.
Critical Impact
A remote unauthenticated attacker can execute arbitrary JavaScript in an authenticated user's browser session, potentially leading to session hijacking, credential theft, or administrative account takeover within WordPress environments.
Affected Products
- Mitchell Bennis Simple File List WordPress plugin
- All versions from n/a through <= 6.3.8
- WordPress installations with the simple-file-list plugin enabled
Discovery Timeline
- 2026-07-13 - CVE-2026-57382 published to NVD
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-57382
Vulnerability Analysis
The vulnerability stems from improper neutralization of user-supplied input during web page generation. The Simple File List plugin reflects attacker-controlled data back into HTTP responses without adequate output encoding or input sanitization. When a victim clicks a crafted URL, the injected payload renders in the browser and executes within the site's origin.
Because the flaw carries a scope change indicator, script execution can affect resources beyond the vulnerable plugin — including the broader WordPress administration interface. The vulnerability requires no privileges to trigger but does require the victim to interact with the malicious link.
The EPSS score of 0.18% suggests low observed exploitation probability, though reflected XSS in WordPress plugins remains a common vector in phishing-driven campaigns targeting site administrators.
Root Cause
The plugin fails to sanitize or encode input parameters before echoing them into HTML output. This is a canonical CWE-79 pattern where user input flows directly from an HTTP request parameter into the response body without passing through WordPress escaping functions such as esc_html(), esc_attr(), or wp_kses().
Attack Vector
An attacker crafts a URL containing a malicious JavaScript payload in a vulnerable parameter processed by the Simple File List plugin. The attacker delivers this URL through phishing, forum posts, or malicious advertising. When an authenticated WordPress user clicks the link, the payload executes in their browser context. See the Patchstack WordPress Vulnerability Report for additional technical details.
Detection Methods for CVE-2026-57382
Indicators of Compromise
- HTTP requests to Simple File List plugin endpoints containing URL-encoded <script> tags, javascript: URIs, or event handler attributes such as onerror= and onload=.
- Unexpected outbound requests from administrator browsers to attacker-controlled domains following clicks on external links.
- WordPress admin session cookies appearing in web server referrer logs or third-party analytics.
Detection Strategies
- Deploy Web Application Firewall (WAF) rules that identify reflected XSS payloads in query strings and POST bodies targeting /wp-content/plugins/simple-file-list/ paths.
- Inspect WordPress access logs for anomalous parameter values containing HTML entities, script fragments, or encoded JavaScript.
- Correlate phishing email indicators with subsequent administrator activity involving the vulnerable plugin.
Monitoring Recommendations
- Enable Content Security Policy (CSP) reporting to capture blocked inline script execution attempts on WordPress admin pages.
- Monitor plugin version inventory across managed WordPress sites and alert when simple-file-list versions at or below 6.3.8 are detected.
- Log and review all administrator authentication events for unusual source IPs following reported phishing incidents.
How to Mitigate CVE-2026-57382
Immediate Actions Required
- Identify all WordPress installations running the Simple File List plugin and confirm the installed version.
- Update the simple-file-list plugin to a version later than 6.3.8 once the vendor publishes a patched release.
- If no patched version is available, deactivate and remove the plugin until a fix is confirmed.
- Rotate WordPress administrator credentials and invalidate active sessions if exploitation is suspected.
Patch Information
At the time of publication, the vulnerability affects all versions up to and including 6.3.8. Refer to the Patchstack advisory and the plugin's official WordPress repository page for updated release information.
Workarounds
- Deploy a WAF with rule sets targeting reflected XSS patterns until the plugin is patched or removed.
- Enforce a strict Content Security Policy that blocks inline scripts and restricts script sources to trusted origins.
- Train WordPress administrators to avoid clicking untrusted links while authenticated to the admin console.
- Restrict WordPress admin access by IP allowlist where operationally feasible to reduce the attack surface.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
