CVE-2025-49923 Overview
CVE-2025-49923 is a DOM-based Cross-Site Scripting (XSS) vulnerability [CWE-79] in the Craig Hewitt Seriously Simple Podcasting plugin for WordPress. The flaw stems from improper neutralization of input during web page generation. It affects all versions of seriously-simple-podcasting up to and including 3.11.1. An authenticated attacker with high privileges can inject script that executes in a victim's browser after user interaction. The scope is changed, meaning the injected script can affect resources beyond the vulnerable component's security boundary.
Critical Impact
Successful exploitation enables execution of arbitrary JavaScript in the victim's browser session, potentially leading to session theft, administrative action hijacking, or redirection to attacker-controlled infrastructure.
Affected Products
- Castos Seriously Simple Podcasting WordPress Plugin
- All versions from n/a through 3.11.1
- WordPress sites using the seriously-simple-podcasting plugin
Discovery Timeline
- 2025-10-22 - CVE-2025-49923 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-49923
Vulnerability Analysis
The vulnerability is a DOM-based Cross-Site Scripting flaw in the Seriously Simple Podcasting plugin. DOM-based XSS occurs when client-side JavaScript writes attacker-controllable data into the Document Object Model without adequate sanitization or encoding. The malicious payload never needs to reach the server in a reflected form. Instead, the browser processes untrusted input directly and treats it as executable script.
Exploitation requires an authenticated user with high privileges to configure or store the malicious payload. A second user must then interact with the affected view for the script to execute. Because the vulnerability has scope change semantics, the injected script can impact other components under the same origin, including WordPress administrative interfaces.
Root Cause
The root cause is improper neutralization of user-supplied input during web page generation, classified under [CWE-79]. Client-side code in the plugin renders values into the DOM without applying context-appropriate encoding such as textContent assignment or safe templating. When those values contain HTML or JavaScript syntax, the browser parses them as active content.
Attack Vector
The attack vector is network-based and requires user interaction. An attacker with high-privilege access to the WordPress backend stores a crafted payload within plugin-managed content. When a targeted user loads the page that renders this content, the payload executes in the context of the WordPress site. The attacker can then exfiltrate cookies, invoke privileged actions via the WordPress REST API, or pivot to further administrative compromise.
No verified public proof-of-concept code is available for CVE-2025-49923. Technical details are documented in the Patchstack WordPress Vulnerability Advisory.
Detection Methods for CVE-2025-49923
Indicators of Compromise
- Unexpected <script> tags, javascript: URIs, or event-handler attributes stored in podcast metadata fields managed by the plugin.
- Outbound browser requests from authenticated administrator sessions to unfamiliar domains shortly after loading podcast admin pages.
- New or modified WordPress user accounts with elevated privileges created without a corresponding admin action log entry.
Detection Strategies
- Inventory WordPress installations and identify sites running seriously-simple-podcasting version 3.11.1 or earlier.
- Review database entries associated with the plugin for HTML or JavaScript syntax in fields expected to hold plain text.
- Enable and review WordPress audit logging for privileged actions performed against podcast episode and settings endpoints.
Monitoring Recommendations
- Deploy a Content Security Policy (CSP) in report-only mode to identify unexpected inline script execution on WordPress admin pages.
- Forward WordPress and web server logs to a centralized platform for correlation of anomalous admin activity.
- Alert on repeated administrative logins from atypical geolocations or IP ranges that touch podcast plugin URLs.
How to Mitigate CVE-2025-49923
Immediate Actions Required
- Upgrade the Seriously Simple Podcasting plugin to a version later than 3.11.1 as soon as the vendor publishes a fixed release.
- Audit all high-privilege WordPress accounts and remove unnecessary administrator or editor access.
- Rotate authentication cookies, application passwords, and API keys for any account that accessed the plugin admin interface.
Patch Information
Refer to the Patchstack WordPress Vulnerability Advisory for the latest patch status. The advisory identifies affected versions up to 3.11.1 and tracks vendor remediation. Apply plugin updates through the WordPress dashboard or via WP-CLI once available.
Workarounds
- Restrict access to the WordPress admin area with IP allowlists or a web application firewall (WAF) rule that filters HTML in plugin-specific parameters.
- Deactivate the seriously-simple-podcasting plugin until a patched release is deployed if podcast functionality is not business-critical.
- Enforce a strict Content Security Policy that blocks inline script execution on WordPress administrative pages.
# Configuration example: update the plugin via WP-CLI once a fixed version is released
wp plugin update seriously-simple-podcasting --version=<patched-version>
# Temporary workaround: deactivate the vulnerable plugin
wp plugin deactivate seriously-simple-podcasting
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
