CVE-2026-25353 Overview
CVE-2026-25353 is a reflected cross-site scripting (XSS) vulnerability affecting the Nooni WordPress theme by skygroup. The flaw stems from improper neutralization of user input during web page generation [CWE-79]. All versions of the Nooni theme through 1.5.1 are affected. An attacker can craft a malicious URL that, when visited by an authenticated user, executes arbitrary JavaScript in the victim's browser context. Successful exploitation can lead to session token theft, account takeover, or unauthorized actions within the WordPress site.
Critical Impact
Reflected XSS in the Nooni theme enables attackers to execute arbitrary JavaScript in a victim's browser, potentially leading to session hijacking and administrative compromise of WordPress sites.
Affected Products
- skygroup Nooni WordPress theme — all versions through 1.5.1
Discovery Timeline
- 2026-03-25 - CVE-2026-25353 published to NVD
- 2026-04-24 - Last updated in NVD database
Technical Details for CVE-2026-25353
Vulnerability Analysis
The Nooni theme fails to properly sanitize or encode user-supplied input before reflecting it into rendered HTML output. This allows an attacker to inject script content through crafted request parameters. When a victim follows a malicious link, the injected payload executes in the context of the WordPress site origin. The attacker inherits the victim's privileges within the application, which is particularly dangerous when targeting administrators.
The vulnerability is classified under [CWE-79], Improper Neutralization of Input During Web Page Generation. Reflected XSS requires user interaction, since the payload travels in the request and is mirrored back in the response. Exploitation typically combines a malicious URL with social engineering or phishing.
Root Cause
The root cause is missing or insufficient output encoding when the theme renders request parameters into the page. WordPress provides built-in escaping functions such as esc_html(), esc_attr(), and esc_url() for safe output. The theme's vulnerable code paths emit attacker-controlled data without applying these escaping routines, breaking the trust boundary between HTTP input and HTML output.
Attack Vector
The attack vector is network-based and requires user interaction. An attacker constructs a URL containing a JavaScript payload in a parameter handled by the Nooni theme. The attacker delivers the link through phishing email, malicious advertising, or a controlled site. When the victim clicks the link while authenticated to the WordPress site, the injected script executes. The scope is changed because the malicious script runs in the security context of the WordPress origin and can read cookies, exfiltrate session data, or perform actions on behalf of the user.
No verified exploit code or public proof-of-concept is currently listed for this CVE. Refer to the Patchstack WordPress Vulnerability Report for additional technical context.
Detection Methods for CVE-2026-25353
Indicators of Compromise
- HTTP request logs containing URL parameters with <script>, javascript:, onerror=, or onload= payloads targeting Nooni theme endpoints.
- Unexpected outbound requests from administrator browsers to attacker-controlled domains shortly after visiting crafted URLs.
- Creation of new administrative WordPress accounts or unauthorized plugin/theme installations following user clicks on suspicious links.
Detection Strategies
- Inspect web server access logs for encoded XSS payloads, including URL-encoded %3Cscript%3E and HTML entity variants in query strings referencing Nooni theme files.
- Deploy a web application firewall (WAF) with rules tuned to identify reflected XSS patterns in HTTP requests to WordPress sites.
- Review WordPress audit logs for unexpected privileged actions performed by administrators within minutes of email or link-based engagement.
Monitoring Recommendations
- Monitor wp-content/themes/nooni/ request patterns for anomalous query string content and high request volumes from single sources.
- Enable browser-side telemetry via Content Security Policy (CSP) violation reporting to surface inline script injection attempts.
- Alert on administrative session activity originating from unusual IP addresses or user agents after a known phishing campaign.
How to Mitigate CVE-2026-25353
Immediate Actions Required
- Identify all WordPress installations running the Nooni theme version 1.5.1 or earlier through inventory and asset management tooling.
- Apply the vendor patch or upgrade to a fixed Nooni release as soon as it is available from skygroup.
- Force password resets and invalidate active sessions for all administrative WordPress users on affected sites.
- Implement a strict Content Security Policy to reduce the impact of any remaining reflected XSS vectors.
Patch Information
The vulnerability affects Nooni versions through 1.5.1. Site administrators should consult the Patchstack WordPress Vulnerability Report for the latest patched version and update through the WordPress theme management interface.
Workarounds
- Deploy a WAF rule that blocks requests containing common XSS payload signatures targeting Nooni theme paths until a patch is applied.
- Restrict administrative access to the WordPress backend using IP allowlisting or a VPN to reduce the exposure of privileged sessions.
- Disable or replace the Nooni theme on production sites until a fixed version is verified and deployed.
- Enforce HTTP-only and Secure cookie flags on WordPress session cookies to limit JavaScript access to authentication tokens.
# Example Content Security Policy header for Apache/Nginx to mitigate reflected XSS
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"
Header set X-XSS-Protection "1; mode=block"
Header set X-Content-Type-Options "nosniff"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
