CVE-2025-13622: Jabbernotification Plugin XSS Vulnerability

CVE-2025-13622 Overview

CVE-2025-13622 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Jabbernotification plugin for WordPress. The flaw affects all versions up to and including 0.99-RC2. The vulnerability resides in admin.php where the PATH_INFO value is reflected without proper input sanitization or output escaping. Unauthenticated attackers can craft malicious URLs that inject arbitrary web scripts. Successful exploitation requires user interaction, typically tricking an authenticated user into clicking a crafted link. Executed scripts run in the victim's browser context, enabling session theft, credential harvesting, or unauthorized administrative actions.

Critical Impact
Unauthenticated attackers can execute arbitrary JavaScript in a victim's browser session, potentially compromising WordPress administrator accounts through crafted links.

Affected Products

WordPress Jabbernotification plugin (jabberbenachrichtigung) versions through 0.99-RC2
WordPress sites with the plugin installed and active
All WordPress installations exposing the plugin's admin.php endpoint

Discovery Timeline

2025-12-05 - CVE CVE-2025-13622 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-13622

Vulnerability Analysis

The vulnerability is classified as Cross-Site Scripting [CWE-79]. The Jabbernotification plugin reflects the PATH_INFO server variable back into rendered HTML output without applying sanitization or escaping routines. WordPress provides built-in helpers such as esc_html(), esc_attr(), and sanitize_text_field() for this purpose, but the plugin bypasses them at the affected location in jabbernotification.php around line 85. Because the reflected value originates from the URL path, attackers control it entirely through crafted requests. The injected script executes within the WordPress site's origin, inheriting the victim's authentication cookies and session state.

Root Cause

The root cause is missing input validation and output encoding on the PATH_INFO component of requests to the plugin's admin endpoint. The plugin concatenates untrusted request data directly into HTML output. This pattern violates OWASP output encoding guidance and allows arbitrary HTML and JavaScript to be rendered by the browser.

Attack Vector

Exploitation is network-based and requires no authentication. An attacker crafts a URL targeting the plugin's admin.php with a malicious PATH_INFO payload containing JavaScript. The attacker then delivers the URL through phishing, social engineering, or embedded links on attacker-controlled sites. When a logged-in WordPress user visits the link, the payload executes in their browser context. Common outcomes include stealing authentication cookies, performing forced administrative actions via CSRF-like flows, or redirecting users to attacker infrastructure. See the Wordfence Vulnerability Report and the WordPress Plugin Code Reference for technical detail on the affected code path.

Detection Methods for CVE-2025-13622

Indicators of Compromise

Web server access logs containing requests to admin.php with PATH_INFO values including <script>, javascript:, onerror=, or URL-encoded equivalents such as %3Cscript%3E.
Referer headers pointing to unfamiliar external domains preceding administrator sessions on WordPress.
Unexpected outbound requests from WordPress admin sessions to attacker-controlled domains.
Presence of the jabberbenachrichtigung plugin directory at version 0.99-RC2 or earlier.

Detection Strategies

Deploy a Web Application Firewall (WAF) rule matching XSS patterns in request paths targeting the Jabbernotification plugin.
Inspect HTTP logs for anomalous long PATH_INFO strings or encoded script fragments on the plugin endpoint.
Correlate WordPress audit log entries with suspicious URL activity to identify compromised administrator sessions.

Monitoring Recommendations

Enable verbose access logging on the WordPress web server and forward logs to a centralized SIEM.
Alert on HTTP responses reflecting URL-derived content into HTML for the affected plugin path.
Monitor for creation of new WordPress administrator accounts or unexpected plugin and theme modifications following suspicious requests.

How to Mitigate CVE-2025-13622

Immediate Actions Required

Deactivate and remove the Jabbernotification plugin until a patched release is available.
Audit WordPress user accounts and revoke sessions for administrators who may have clicked untrusted links.
Rotate WordPress administrator passwords and invalidate authentication cookies.
Review site content and installed plugins for signs of unauthorized modification.

Patch Information

No patched version of the Jabbernotification plugin has been published at the time of this writing. Version 0.99-RC2 remains the latest release. Refer to the WordPress Plugin Overview page for update status and consult the Wordfence Vulnerability Report for remediation guidance.

Workarounds

Block external access to the plugin's admin.php endpoint at the web server or WAF layer.
Apply generic WAF rules that reject requests containing script tags or JavaScript event handlers in URL paths.
Enforce a strict Content Security Policy (CSP) that disallows inline scripts to reduce XSS impact.
Require administrators to use browsers with XSS auditors and enforce cookie flags HttpOnly and SameSite=Strict on WordPress session cookies.

bash

# Example nginx rule to block script payloads in requests to the affected plugin
location ~* /wp-content/plugins/jabberbenachrichtigung/ {
    if ($request_uri ~* "(<|%3C)script|javascript:|onerror=|onload=") {
        return 403;
    }
}