CVE-2025-23596 Overview
CVE-2025-23596 is a Reflected Cross-Site Scripting (XSS) vulnerability in the grafeon Notifikácie.sk WordPress plugin (notifikacie-sk). The flaw affects all plugin versions up to and including 1.0. It stems from improper neutralization of user-supplied input during web page generation [CWE-79]. An unauthenticated attacker can craft a malicious URL that, when clicked by a victim, executes arbitrary JavaScript in the victim's browser within the context of the affected WordPress site.
Critical Impact
Successful exploitation allows attackers to execute arbitrary script in a victim's browser, enabling session theft, credential harvesting, or redirection to attacker-controlled infrastructure. Exploitation requires user interaction such as clicking a crafted link.
Affected Products
- grafeon Notifikácie.sk WordPress plugin (notifikacie-sk)
- All versions from n/a through 1.0
- WordPress sites with the plugin installed and active
Discovery Timeline
- 2025-01-31 - CVE-2025-23596 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-23596
Vulnerability Analysis
The vulnerability is a Reflected XSS issue [CWE-79] in the Notifikácie.sk plugin for WordPress. The plugin accepts input through HTTP request parameters and reflects that input back into the rendered HTML response without proper sanitization or output encoding. An attacker can inject HTML or JavaScript payloads that execute in the browser of any user who follows a crafted link to the vulnerable endpoint.
The attack vector is network-based and requires user interaction. Because the scope is changed, injected script runs in the security context of the WordPress site, giving the attacker access to cookies, session tokens, and any data accessible to the targeted user.
Root Cause
The root cause is the absence of input validation and output escaping when the plugin processes request parameters and writes them into the response page. WordPress provides helper functions such as esc_html(), esc_attr(), and sanitize_text_field() that mitigate this class of issue, but the affected plugin code paths do not apply them before reflecting the values.
Attack Vector
An attacker crafts a URL containing a malicious payload in a vulnerable parameter and delivers it through phishing, social media, or other channels. When a victim with an active WordPress session visits the URL, the payload is reflected into the response and executed by the browser. The injected script can exfiltrate session cookies, perform actions on behalf of the user, or pivot to other administrative functions if the victim holds elevated privileges.
Detailed exploitation specifics are documented in the Patchstack Vulnerability Report.
Detection Methods for CVE-2025-23596
Indicators of Compromise
- HTTP requests to plugin endpoints containing URL-encoded <script> tags, javascript: URIs, or HTML event handlers such as onerror= and onload=.
- Web server access logs showing unusual query string parameters targeting notifikacie-sk paths.
- Browser console errors or unexpected outbound requests originating from pages that render plugin output.
Detection Strategies
- Inspect web server and WAF logs for suspicious parameter values reaching the Notifikácie.sk plugin endpoints.
- Deploy a Web Application Firewall (WAF) ruleset that flags reflected XSS patterns in HTTP requests to WordPress sites.
- Review referrer headers and click telemetry for inbound traffic carrying script payloads in the query string.
Monitoring Recommendations
- Continuously monitor WordPress plugin inventory and version state for sites running notifikacie-sk version 1.0 or earlier.
- Alert on administrator session anomalies such as new sessions from unexpected IP addresses following user clicks on external links.
- Track outbound HTTP requests from authenticated WordPress sessions to uncategorized or recently registered domains.
How to Mitigate CVE-2025-23596
Immediate Actions Required
- Deactivate and remove the Notifikácie.sk plugin from any WordPress installation until a patched release is available.
- Force a password reset and session invalidation for administrative WordPress users who may have interacted with crafted links.
- Apply WAF rules to block requests containing script tags or event-handler payloads targeting the plugin's endpoints.
Patch Information
At the time of publication, no fixed version is listed for the Notifikácie.sk plugin. The advisory indicates the issue affects versions up to and including 1.0 with no patched release identified. Monitor the Patchstack Vulnerability Report and the WordPress.org plugin repository for vendor updates.
Workarounds
- Remove the plugin entirely if a patched version is unavailable, since uninstallation is the only definitive mitigation.
- Enforce a strict Content Security Policy (CSP) that disallows inline script execution to reduce the impact of reflected XSS.
- Restrict access to WordPress admin and plugin endpoints by IP allowlist where operationally feasible.
- Train administrators to avoid clicking unsolicited links that point to their own WordPress site with unusual query parameters.
# Disable the vulnerable plugin via WP-CLI
wp plugin deactivate notifikacie-sk
wp plugin uninstall notifikacie-sk
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
