CVE-2025-59552: Save as PDF Plugin Stored XSS Vulnerability

CVE-2025-59552 Overview

CVE-2025-59552 is a stored cross-site scripting (XSS) vulnerability in the Save as PDF plugin by Pdfcrowd Dev Team for WordPress. The flaw affects all plugin versions up to and including 4.5.2. Improper neutralization of user-supplied input during web page generation lets an authenticated attacker with low privileges inject persistent JavaScript payloads. The injected script executes in the browser context of any user who views the affected page. This vulnerability is classified under CWE-79 and requires user interaction to trigger. Refer to the Patchstack XSS Vulnerability Analysis for advisory details.

Critical Impact
Authenticated attackers can store malicious JavaScript that executes in other users' sessions, enabling session theft, administrative action abuse, and content manipulation.

Affected Products

Pdfcrowd Dev Team Save as PDF plugin (save-as-pdf-by-pdfcrowd) versions up to and including 4.5.2
WordPress installations that have the plugin installed and activated
Sites permitting low-privileged contributors or authors to submit plugin-controlled input

Discovery Timeline

2025-09-22 - CVE-2025-59552 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-59552

Vulnerability Analysis

The vulnerability resides in how the Save as PDF plugin handles user-supplied input rendered back into WordPress pages. The plugin fails to sanitize or encode input before it is written into HTML output. As a result, an attacker can persist arbitrary HTML and JavaScript into stored records. When another user loads a page containing the stored payload, the browser parses and executes the injected script.

Exploitation requires an authenticated account with at least low privileges and depends on victim interaction such as visiting an affected page. The impact spans confidentiality, integrity, and availability at a limited level, and the vulnerability crosses a security boundary because the payload can affect higher-privileged users.

Root Cause

The root cause is missing output encoding and input validation on plugin-controlled fields. WordPress provides sanitization helpers such as sanitize_text_field() and escaping helpers such as esc_html() and esc_attr(). The vulnerable code paths omit these helpers, allowing raw markup to reach the DOM.

Attack Vector

An authenticated attacker submits a payload containing script markup through a plugin-controlled input field. The payload is stored in the WordPress database. Subsequent visitors, including administrators, render the page and execute the attacker's JavaScript in their browser session. The script can exfiltrate cookies, forge requests against the WordPress REST API, or modify page content.

No verified proof-of-concept code has been published. See the Patchstack XSS Vulnerability Analysis for advisory details.

Detection Methods for CVE-2025-59552

Indicators of Compromise

Unexpected <script>, onerror, or onload HTML attributes stored in WordPress wp_posts, wp_postmeta, or plugin-specific tables
Outbound HTTP requests from administrator browsers to unfamiliar domains shortly after loading pages containing plugin content
New administrator accounts, altered user roles, or unexpected changes to plugin or theme files
Browser console errors originating from plugin-rendered markup

Detection Strategies

Query the WordPress database for plugin-controlled fields containing HTML event handlers or <script fragments
Review web server access logs for POST requests to plugin endpoints followed by anomalous session activity
Deploy a web application firewall rule set that flags reflected and stored XSS patterns targeting the plugin

Monitoring Recommendations

Enable WordPress audit logging for post creation, plugin configuration changes, and user role modifications
Alert on administrator sessions performing unusual REST API calls such as user creation or plugin installation
Monitor Content Security Policy (CSP) violation reports to catch script execution attempts from unexpected origins

How to Mitigate CVE-2025-59552

Immediate Actions Required

Upgrade the Save as PDF plugin to a version later than 4.5.2 once the vendor publishes a fixed release
Restrict contributor, author, and editor accounts to the minimum users required for site operations
Review stored plugin content for injected markup and remove any suspicious entries
Rotate credentials and session tokens for administrators who may have loaded compromised pages

Patch Information

At the time of NVD publication, the advisory indicates that all versions up to and including 4.5.2 are affected. Site operators should monitor the Patchstack XSS Vulnerability Analysis and the plugin's WordPress.org listing for a patched release and apply it promptly.

Workarounds

Deactivate the Save as PDF plugin until a patched version is released if it is not essential to site operations
Deploy a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
Place a web application firewall in front of the WordPress site with rules blocking common XSS payload patterns
Limit plugin configuration and content submission to trusted administrator accounts protected by multi-factor authentication

bash

# Example: disable the plugin using WP-CLI until a patched release is available
wp plugin deactivate save-as-pdf-by-pdfcrowd
wp plugin status save-as-pdf-by-pdfcrowd