CVE-2025-31620: CoverManager Plugin Stored XSS Vulnerability

CVE-2025-31620 Overview

CVE-2025-31620 is a stored Cross-Site Scripting (XSS) vulnerability in the carperfer CoverManager WordPress plugin. The flaw affects all versions of CoverManager through 0.0.1 and stems from improper neutralization of user input during web page generation, tracked under [CWE-79]. An authenticated attacker with low privileges can inject persistent JavaScript payloads that execute in the browsers of users who view the affected pages. Because the stored payload runs in a victim's authenticated session, it can lead to session hijacking, unauthorized actions, and disclosure of limited data across the site.

Critical Impact
A low-privileged authenticated user can store malicious script in the CoverManager plugin. The payload executes in visitors' browsers, enabling session theft and unauthorized actions in the WordPress site.

Affected Products

WordPress CoverManager plugin (covermanager) by carperfer
All versions up to and including 0.0.1
WordPress sites that expose CoverManager functionality to authenticated contributors or higher

Discovery Timeline

2025-03-31 - CVE-2025-31620 published to the National Vulnerability Database (NVD)
2026-06-17 - CVE-2025-31620 last modified in NVD

Technical Details for CVE-2025-31620

Vulnerability Analysis

The CoverManager plugin fails to sanitize or encode user-supplied input before rendering it inside WordPress pages. An authenticated attacker submits crafted input through a plugin field that the application later reflects into the HTML response without escaping. When another user loads the affected view, the browser parses the injected markup and executes attacker-controlled JavaScript in the site's origin.

The scope change in the vulnerability metric indicates that the injected script can affect resources beyond the vulnerable component, including the browsing session of administrators who view content the attacker controls. Because the payload is stored server-side, exploitation does not require re-delivery for each victim.

Exploitation still requires user interaction, so the payload triggers when a victim navigates to a page that renders the tainted content. Impact is limited to what the victim's session permits, but administrator victims broaden the blast radius considerably.

Root Cause

The root cause is missing output encoding and input validation in the CoverManager plugin code paths that render user-supplied values. Input intended to be treated as text is emitted into an HTML context without applying esc_html(), esc_attr(), or wp_kses(), allowing raw markup and script tags to reach the DOM.

Attack Vector

The attack vector is network-based over HTTP. An authenticated attacker with contributor-level or comparable privileges submits a crafted payload through a plugin input, such as an event title, description, or embed field. The malicious content is persisted in the WordPress database.

When an administrator, editor, or unauthenticated visitor loads the page that renders the stored value, the browser executes the attacker's script. The script can read cookies (unless flagged HttpOnly), issue authenticated requests, exfiltrate DOM content, or pivot to CSRF-style abuse of WordPress REST endpoints.

Refer to the Patchstack WordPress Vulnerability Report for advisory details.

Detection Methods for CVE-2025-31620

Indicators of Compromise

Unexpected <script>, <iframe>, onerror=, or onload= strings stored in CoverManager records within the WordPress database
Outbound requests from browser sessions to unfamiliar domains shortly after loading pages rendered by the CoverManager plugin
New or modified WordPress administrator accounts, plugin installations, or option changes shortly after content authored via CoverManager was viewed
Anomalous session cookie usage from IP addresses that do not match a legitimate administrator's baseline

Detection Strategies

Inspect wp_posts, wp_postmeta, and any CoverManager-specific tables for HTML or JavaScript sequences using pattern searches for <script, javascript:, and event-handler attributes
Review web server access logs for POST requests to CoverManager endpoints originating from low-privileged accounts and correlate with subsequent GET requests by administrators
Enable and monitor Content Security Policy (CSP) violation reports to identify inline script execution attempts on pages that should not contain scripts

Monitoring Recommendations

Alert on creation or modification of WordPress administrator accounts, especially from sessions that recently viewed CoverManager-rendered pages
Monitor plugin activity logs for edits to CoverManager entries by non-administrator roles
Track outbound HTTP requests from browsers of privileged users to newly registered or uncategorized domains

How to Mitigate CVE-2025-31620

Immediate Actions Required

Deactivate and remove the CoverManager plugin until a patched release is confirmed by the vendor, since all versions through 0.0.1 are affected
Audit existing CoverManager content for injected HTML or script and remove any tainted entries
Rotate WordPress administrator credentials and invalidate active sessions if exploitation is suspected
Restrict contributor and author account creation and review recently added low-privileged users

Patch Information

At the time of the last NVD update on 2026-06-17, no fixed version has been published; the advisory covers CoverManager from unspecified initial release through 0.0.1. Monitor the Patchstack advisory for a vendor patch and upgrade as soon as one becomes available.

Workarounds

Uninstall the CoverManager plugin as the most reliable mitigation while no patch exists
Enforce a strict Content Security Policy that disallows inline scripts on WordPress front-end and admin pages
Limit account roles so that only trusted users can create or edit CoverManager content, and require multi-factor authentication for administrators
Deploy a web application firewall rule set that inspects POST bodies to CoverManager endpoints for script tags and event-handler attributes

bash

# Disable the vulnerable plugin using WP-CLI
wp plugin deactivate covermanager
wp plugin delete covermanager

# Search the database for stored script payloads in post content
wp db query "SELECT ID, post_title FROM wp_posts WHERE post_content LIKE '%<script%' OR post_content LIKE '%javascript:%';"