CVE-2025-23480 Overview
CVE-2025-23480 is a stored Cross-Site Scripting (XSS) vulnerability in the MicahBlu RSVP ME WordPress plugin. The flaw affects all versions of rsvp-me up to and including 1.9.9. The plugin fails to properly neutralize user-supplied input during web page generation, allowing an authenticated attacker with low privileges to inject persistent JavaScript payloads. Because the payload is stored server-side, it executes in the browser of any user who views the affected page. The vulnerability is tracked under CWE-79.
Critical Impact
Authenticated attackers can inject persistent JavaScript that executes in visitors' browsers, enabling session theft, credential harvesting, and administrative account takeover through scope-changed script execution.
Affected Products
- MicahBlu RSVP ME WordPress plugin versions through 1.9.9
- WordPress sites with the rsvp-me plugin installed and active
- Any site allowing low-privileged users to submit RSVP content
Discovery Timeline
- 2025-03-03 - CVE-2025-23480 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-23480
Vulnerability Analysis
The RSVP ME plugin accepts user input through its RSVP form and administrative interfaces without applying sufficient output encoding when the data is rendered back to the DOM. An authenticated user with low privileges can submit crafted input containing HTML or JavaScript. The plugin persists this input in the WordPress database and later renders it into pages served to other users, including administrators.
The attack requires user interaction, meaning a victim must load the page containing the malicious content. Successful exploitation crosses a security scope boundary, allowing the injected script to run in the context of the vulnerable site and access cookies, session tokens, and privileged UI elements available to the viewing user.
Root Cause
The root cause is improper neutralization of input during web page generation [CWE-79]. The plugin does not apply WordPress escaping functions such as esc_html(), esc_attr(), or wp_kses() to fields before echoing them into HTML output. Input validation on submission is also insufficient to strip or reject script content.
Attack Vector
The attack is executed remotely over the network and requires the attacker to hold a low-privilege authenticated account on the WordPress instance. The attacker submits a crafted payload through an RSVP form field. When an administrator or another site visitor loads a page rendering that field, the browser parses and executes the attacker-controlled script. Refer to the Patchstack XSS Vulnerability Report for additional technical detail.
Detection Methods for CVE-2025-23480
Indicators of Compromise
- Unexpected <script>, onerror=, or onload= strings stored in the wp_postmeta or plugin-specific database tables used by rsvp-me.
- Outbound HTTP requests from administrator browser sessions to unfamiliar third-party domains shortly after viewing RSVP content.
- New WordPress administrator accounts or unexpected changes to existing accounts following administrator visits to RSVP pages.
Detection Strategies
- Query the WordPress database for RSVP plugin records containing HTML event handler substrings or <script tags.
- Review web server access logs for POST requests to RSVP plugin endpoints containing URL-encoded script payloads.
- Enable Content Security Policy (CSP) reporting to capture blocked inline script executions on pages generated by the plugin.
Monitoring Recommendations
- Monitor WordPress audit logs for content submissions from low-privileged accounts followed by administrator page views.
- Alert on modifications to WordPress user roles, options, or plugin configuration originating from unexpected sessions.
- Track browser telemetry for anomalous JavaScript execution or DOM modifications on pages served by the rsvp-me plugin.
How to Mitigate CVE-2025-23480
Immediate Actions Required
- Deactivate the RSVP ME plugin on all WordPress instances until a patched release is available and verified.
- Audit existing RSVP plugin data for stored script content and purge malicious entries from the database.
- Rotate administrator credentials and invalidate active sessions if the plugin was exposed to untrusted contributors.
Patch Information
No fixed version is identified in the enriched CVE data at the time of publication. The advisory indicates the vulnerability affects versions up to and including 1.9.9. Consult the Patchstack XSS Vulnerability Report for the latest remediation status and apply any vendor-released update immediately upon availability.
Workarounds
- Restrict account registration and remove low-privilege accounts that do not require RSVP submission access.
- Deploy a web application firewall (WAF) rule to block requests containing script tags or JavaScript event handlers targeted at plugin endpoints.
- Implement a strict Content Security Policy that disallows inline script execution on pages rendering RSVP content.
# Example WAF rule pattern (ModSecurity) to block script payloads on plugin endpoints
SecRule REQUEST_URI "@contains /wp-admin/admin-ajax.php" \
"chain,id:1002348,phase:2,deny,status:403,log,msg:'Potential XSS in rsvp-me plugin'"
SecRule ARGS "@rx (?i)(<script|onerror\s*=|onload\s*=|javascript:)" "t:none,t:urlDecode"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
