CVE-2025-49443: Bacon Ipsum Plugin Stored XSS Vulnerability

CVE-2025-49443 Overview

CVE-2025-49443 is a stored Cross-Site Scripting (XSS) vulnerability in the Chris McCoy Bacon Ipsum WordPress plugin. The flaw stems from improper neutralization of user-supplied input during web page generation, tracked as [CWE-79]. Attackers with low-privileged authenticated access can inject malicious scripts that persist in the application and execute in the browsers of other users, including administrators. The vulnerability affects all versions of the Bacon Ipsum plugin up to and including version 2.4.

Critical Impact
Authenticated attackers can inject persistent JavaScript payloads that execute in victim browsers, enabling session theft, account takeover, and administrative privilege abuse within a WordPress site.

Affected Products

Chris McCoy Bacon Ipsum WordPress Plugin versions n/a through 2.4
WordPress installations with the bacon-ipsum plugin activated
Any site delivering pages that render plugin-generated content to authenticated or anonymous users

Discovery Timeline

2025-06-06 - CVE-2025-49443 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-49443

Vulnerability Analysis

The vulnerability is a stored XSS flaw in the Bacon Ipsum plugin, a WordPress utility that generates placeholder text. Input supplied through the plugin interface is stored server-side without adequate sanitization or output encoding. When the affected content is rendered in a browser, the injected script executes in the context of the WordPress site.

Because the injection is persistent, every user who views the affected page triggers the payload. Exploitation requires low-level authenticated access and user interaction from a victim, but the scope changes to affect other components rendering the tainted output. Successful exploitation can lead to session hijacking, credential harvesting, redirection to attacker-controlled infrastructure, and delivery of secondary payloads.

Root Cause

The root cause is improper neutralization of input during web page generation [CWE-79]. The plugin fails to apply WordPress sanitization primitives such as sanitize_text_field() on input and esc_html() or esc_attr() on output. As a result, HTML and JavaScript submitted by an authenticated user is stored verbatim and rendered as active content.

Attack Vector

An authenticated attacker with contributor-level or similar low-privileged access submits a crafted payload containing HTML or JavaScript through a plugin-controlled input field. The payload is persisted in the WordPress database. When another user, including an administrator, loads a page that renders the stored value, the browser executes the script within the origin of the WordPress site. See the Patchstack XSS Vulnerability Report for advisory details.

Detection Methods for CVE-2025-49443

Indicators of Compromise

Unexpected <script>, <iframe>, or on*= event handler strings stored in wp_posts, wp_postmeta, or plugin-specific tables
Outbound browser requests from administrative sessions to unfamiliar domains shortly after loading plugin-rendered pages
New or modified WordPress administrator accounts created without a corresponding legitimate login event
Anomalous cookie or session token access patterns from authenticated WordPress users

Detection Strategies

Inventory WordPress installations for the bacon-ipsum plugin at version 2.4 or earlier and flag matches for remediation
Review database entries associated with the plugin for HTML tags, JavaScript function names, or encoded payloads such as %3Cscript%3E
Correlate WordPress user activity logs with web server access logs to identify low-privileged accounts submitting content that later triggers script execution in administrator sessions

Monitoring Recommendations

Deploy a web application firewall (WAF) ruleset that inspects POST bodies to plugin endpoints for XSS signatures
Enable and forward WordPress audit logs to a centralized data lake for retention and query
Monitor for browser-side security policy violations by enabling Content Security Policy (CSP) reporting on WordPress admin and public pages

How to Mitigate CVE-2025-49443

Immediate Actions Required

Identify all WordPress sites running the Bacon Ipsum plugin and confirm the installed version
Deactivate and remove the plugin on any site where it is not actively required
Restrict contributor and author account creation and audit existing low-privileged accounts for legitimacy
Rotate administrator session cookies and reset credentials for any account that may have loaded tainted content

Patch Information

At the time of publication, the advisory lists affected versions from n/a through 2.4 with no fixed version referenced. Consult the Patchstack XSS Vulnerability Report for the current patch status and apply any vendor update as soon as it becomes available.

Workarounds

Uninstall the Bacon Ipsum plugin until a patched release is verified
Enforce a strict Content Security Policy that disallows inline script execution on WordPress pages
Apply a virtual patch through a WAF to block script tags and event handler attributes in requests targeting plugin endpoints
Limit account provisioning so that only trusted users hold roles capable of submitting content processed by the plugin

bash

# Configuration example: remove the vulnerable plugin via WP-CLI
wp plugin deactivate bacon-ipsum
wp plugin delete bacon-ipsum

# Optional: add a restrictive Content-Security-Policy header at the web server layer
# nginx snippet
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'self';" always;