CVE-2025-30616: Latest Custom Post Type Updates XSS Flaw

CVE-2025-30616 Overview

CVE-2025-30616 is a reflected cross-site scripting (XSS) vulnerability in the David Wood Latest Custom Post Type Updates WordPress plugin. The flaw affects all versions from initial release through 1.3.0. Attackers can inject malicious script payloads into vulnerable parameters that the plugin reflects back to users without proper neutralization. Successful exploitation requires user interaction, such as clicking a crafted link. The vulnerability is classified under CWE-79 and impacts site visitors and administrators who interact with attacker-supplied URLs.

Critical Impact
Attackers can execute arbitrary JavaScript in victim browsers, enabling session hijacking, credential theft, and unauthorized actions in the WordPress administrative context.

Affected Products

David Wood Latest Custom Post Type Updates plugin for WordPress
All versions through 1.3.0
WordPress sites running the vulnerable plugin

Discovery Timeline

2025-04-03 - CVE-2025-30616 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-30616

Vulnerability Analysis

The vulnerability stems from improper neutralization of user-supplied input during web page generation. The plugin reflects attacker-controlled parameters into HTTP responses without applying output encoding or sanitization. When a victim follows a crafted URL, the injected JavaScript executes in the context of the WordPress site.

Reflected XSS in WordPress plugin contexts often enables an attacker to perform actions on behalf of an authenticated user. This includes creating administrator accounts, exfiltrating session tokens, and modifying site content. The scope change indicated in the scoring suggests the injected script can affect resources beyond the vulnerable component.

The EPSS probability for this CVE is 0.219%, reflecting current exploitation likelihood estimates.

Root Cause

The root cause is missing input sanitization and output encoding in plugin request handlers. User-supplied query parameters reach the HTML response context without passing through WordPress functions such as esc_html(), esc_attr(), or wp_kses(). The plugin trusts request data and echoes it directly into the rendered page.

Attack Vector

An attacker crafts a URL containing a JavaScript payload in a vulnerable parameter. The attacker delivers the link through phishing email, social media, or a compromised site. When a logged-in WordPress user clicks the link, their browser executes the payload under the site's origin. The script can then read cookies, submit authenticated requests, or redirect the user.

The vulnerability manifests in request handling logic exposed by the plugin. See the Patchstack Vulnerability Report for additional technical details.

Detection Methods for CVE-2025-30616

Indicators of Compromise

HTTP requests to WordPress endpoints containing URL-encoded <script>, javascript:, or onerror= patterns
Outbound requests from administrator browsers to unknown external domains shortly after clicking inbound links
Unexpected creation of administrator accounts or modification of plugin settings
Web server access logs showing reflected parameter values matching XSS payload signatures

Detection Strategies

Inspect WordPress access logs for query strings containing HTML or JavaScript syntax targeting the latest-custom-post-type-updates plugin paths
Deploy a web application firewall (WAF) rule that blocks reflected XSS patterns on plugin endpoints
Monitor browser console errors and content security policy (CSP) violation reports for blocked inline scripts
Audit installed plugin versions and flag any instance of Latest Custom Post Type Updates at version 1.3.0 or earlier

Monitoring Recommendations

Forward WordPress and reverse proxy logs to a centralized analytics platform for query string inspection
Alert on administrative session activity originating from unexpected geolocations or user agents
Track plugin file integrity and configuration changes through file integrity monitoring

How to Mitigate CVE-2025-30616

Immediate Actions Required

Identify all WordPress installations running Latest Custom Post Type Updates version 1.3.0 or earlier
Deactivate and remove the plugin until a patched version is confirmed available
Force a password reset and session invalidation for administrator accounts if compromise is suspected
Review recent administrative actions, user creation events, and plugin configuration changes

Patch Information

At the time of publication, the Patchstack advisory lists versions up to and including 1.3.0 as vulnerable. Site operators should monitor the WordPress plugin repository for a fixed release and apply the update immediately when available.

Workarounds

Deactivate the plugin until a vendor patch is released
Deploy a WAF rule that blocks requests containing script tags or JavaScript event handlers in query parameters
Apply a strict Content Security Policy that disallows inline scripts and untrusted script sources
Restrict administrative access to known IP ranges through .htaccess or reverse proxy controls

bash

# Example WAF rule pattern (ModSecurity)
SecRule ARGS "@rx (?i)(<script|javascript:|onerror=|onload=)" \
    "id:1003001,phase:2,deny,status:403,msg:'Reflected XSS attempt blocked'"