CVE-2024-10250: Nioland WordPress Theme XSS Vulnerability

CVE-2024-10250 Overview

CVE-2024-10250 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Nioland WordPress theme by Steelthemes. The flaw affects all versions up to and including 1.2.6. It stems from insufficient input sanitization and output escaping on the s (search) parameter. Unauthenticated attackers can inject arbitrary JavaScript that executes in a victim's browser when the victim clicks a crafted link. Successful exploitation can lead to session data exposure, redirection to attacker-controlled resources, or actions performed under the victim's authenticated context.

Critical Impact
Unauthenticated attackers can execute arbitrary JavaScript in a targeted user's browser session by tricking them into clicking a malicious link, potentially compromising WordPress administrator accounts.

Affected Products

Steelthemes Nioland WordPress theme, all versions through 1.2.6
WordPress sites running the Nioland SaaS/Software/Startup/Tech theme
Installations that expose the theme's search functionality via the s parameter

Discovery Timeline

2024-10-23 - CVE-2024-10250 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-10250

Vulnerability Analysis

The vulnerability is classified as Reflected Cross-Site Scripting under CWE-79. The Nioland theme reflects the value of the s query parameter (used for site search) into rendered HTML output without proper sanitization or context-aware escaping. When a victim visits a crafted URL, the injected payload executes in the browser under the site's origin.

Because the injection reflects into pages served by the WordPress site, attackers can access cookies not marked HttpOnly, read DOM contents, and issue authenticated requests on behalf of the victim. The changed scope indicated in the CVSS vector reflects the ability of injected scripts to interact with resources beyond the vulnerable component, such as the WordPress admin interface.

Root Cause

The root cause is missing input sanitization on the s search parameter and missing output escaping when the parameter value is echoed into HTML. WordPress provides helpers such as esc_html(), esc_attr(), and wp_kses() for safely emitting untrusted data, but the vulnerable theme templates do not apply them consistently to search terms before rendering.

Attack Vector

Exploitation requires user interaction. An attacker crafts a URL against the target site containing a JavaScript payload in the s parameter and delivers it through phishing, malicious advertising, forum posts, or social media. When the victim opens the link in an authenticated browser session, the payload executes in the site's origin.

See the Wordfence Vulnerability Report for additional technical details on the vulnerable code path and reproduction steps.

Detection Methods for CVE-2024-10250

Indicators of Compromise

Web server access logs containing requests to the site root or search endpoint with s= parameter values that include <script>, javascript:, onerror=, onload=, or URL-encoded equivalents such as %3Cscript%3E
Referrer headers pointing to unfamiliar third-party domains preceding suspicious s parameter requests
Unexpected outbound requests from administrator browsers to attacker-controlled hosts shortly after clicking external links
Creation of new WordPress administrator accounts or plugin installations without a matching authenticated admin session in audit logs

Detection Strategies

Deploy web application firewall (WAF) rules that flag script tags, event handlers, and JavaScript URI schemes inside the s query parameter
Enable WordPress security plugins that scan for reflected XSS attempts against theme and plugin parameters
Correlate HTTP request logs with browser-side telemetry to identify payloads that reach the vulnerable theme templates

Monitoring Recommendations

Monitor for anomalous spikes in requests containing the s parameter, especially from external referrers
Alert on WordPress admin actions performed within seconds of an admin loading a page with a non-empty s parameter
Track theme file integrity for the Nioland theme directory and log changes to search-related template files

How to Mitigate CVE-2024-10250

Immediate Actions Required

Update the Nioland theme to a version later than 1.2.6 as published in the ThemeForest Nioland Theme Change Log
Force password resets for all WordPress administrators and privileged editors on affected sites
Invalidate active WordPress sessions using wp_destroy_all_sessions() or an equivalent security plugin action
Review recent administrative activity for signs of unauthorized configuration or content changes

Patch Information

Steelthemes has released an updated version of the Nioland theme addressing this vulnerability. Consult the ThemeForest Nioland Theme Change Log for the fixed release version and upgrade instructions. Apply the update through the WordPress admin dashboard or by replacing theme files via SFTP.

Workarounds

Deploy a WAF rule that blocks or sanitizes requests where the s parameter contains HTML tags, JavaScript event handlers, or encoded script payloads
Implement a strict Content Security Policy (CSP) that disallows inline scripts and restricts script sources to trusted origins
Temporarily switch to an alternate theme until the patched version of Nioland is installed
Set the HttpOnly and Secure flags on all WordPress authentication cookies to limit exfiltration through injected scripts

bash

# Example ModSecurity rule to block script payloads in the 's' parameter
SecRule ARGS:s "@rx (?i)(<script|javascript:|onerror=|onload=|%3Cscript)" \
    "id:1002450,phase:2,deny,status:403,log,\
    msg:'CVE-2024-10250 - Reflected XSS attempt in Nioland theme s parameter'"