CVE-2025-46261: Seriously Simple Podcasting XSS Vulnerability

CVE-2025-46261 Overview

CVE-2025-46261 is a stored Cross-Site Scripting (XSS) vulnerability in the Seriously Simple Podcasting WordPress plugin maintained by Castos. The flaw affects all versions up to and including 3.9.0. An authenticated attacker with high privileges can inject malicious script content that persists in the application and executes in the browsers of users who view the affected pages. The issue is categorized under CWE-79, Improper Neutralization of Input During Web Page Generation. User interaction is required for the payload to trigger, and successful exploitation can compromise session state across trust boundaries.

Critical Impact
Stored JavaScript payloads execute in the context of site users and administrators, enabling session theft, forced actions, and content manipulation on the WordPress site.

Affected Products

Castos Seriously Simple Podcasting for WordPress
All versions from initial release through 3.9.0
WordPress sites running the seriously-simple-podcasting plugin

Discovery Timeline

2025-04-24 - CVE-2025-46261 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-46261

Vulnerability Analysis

The vulnerability resides in the Seriously Simple Podcasting plugin's handling of user-supplied input rendered into WordPress pages. Input fields exposed to authenticated users are not properly neutralized before being written into HTML output. As a result, script content submitted by a privileged user is stored in the database and later served to other visitors and administrators. The exploit requires an account with high privileges and one user interaction step, which limits mass exploitation but does not eliminate risk in multi-author or agency-managed WordPress environments.

Root Cause

The root cause is missing or insufficient output encoding when plugin-managed fields are rendered in the WordPress front end or admin dashboard. WordPress provides sanitization helpers such as wp_kses_post, esc_html, and esc_attr, but the affected code paths in versions through 3.9.0 do not apply appropriate escaping for the rendering context. Because the payload is persisted, every subsequent page load reintroduces the injected script.

Attack Vector

An attacker who already holds a high-privilege account, such as an editor or administrator on a multi-user WordPress site, submits crafted podcast metadata or configuration values containing JavaScript. The payload is stored, and when a victim loads the affected page or admin screen the script executes under the site's origin. This crosses a security scope boundary and can be used to escalate access, alter published content, or pivot to other users. Refer to the Patchstack advisory for CVE-2025-46261 for further technical detail.

Detection Methods for CVE-2025-46261

Indicators of Compromise

Unexpected <script> tags, event-handler attributes, or javascript: URIs stored in WordPress post meta, options, or plugin-specific tables tied to seriously-simple-podcasting.
Administrator sessions producing outbound requests to unknown domains after visiting podcast configuration or episode pages.
New or modified WordPress users, application passwords, or role changes shortly after a privileged user accessed plugin pages.

Detection Strategies

Scan the WordPress database for HTML or JavaScript syntax within plugin-managed fields, particularly episode titles, descriptions, and podcast settings.
Correlate web server access logs with admin activity to identify unusual POST requests to plugin endpoints from high-privilege accounts.
Compare the installed plugin version against the fixed release using wp plugin list and flag any host running version 3.9.0 or earlier.

Monitoring Recommendations

Enable WordPress audit logging to capture edits to podcast episodes and plugin settings, including the user identity and source IP.
Monitor browser Content Security Policy (CSP) violation reports for inline script executions originating from /wp-admin/ paths.
Alert on privilege changes, new administrator accounts, or application password creation following access to podcast admin screens.

How to Mitigate CVE-2025-46261

Immediate Actions Required

Update Seriously Simple Podcasting to a version later than 3.9.0 as published on the Patchstack advisory.
Audit all podcast episode fields and plugin settings for injected HTML or JavaScript before and after patching.
Rotate credentials and application passwords for administrator accounts that may have viewed affected pages.

Patch Information

Castos has released a fixed version of the Seriously Simple Podcasting plugin that addresses the improper neutralization issue. Site owners should upgrade through the WordPress plugin manager or by using wp plugin update seriously-simple-podcasting via WP-CLI. Confirm the running version after upgrade and re-run any database sanitization procedures.

Workarounds

Restrict high-privilege WordPress roles to a minimal set of trusted users until the plugin is upgraded.
Deploy a Web Application Firewall (WAF) rule to block script tags and event-handler attributes in POST bodies destined for plugin endpoints.
Enforce a strict Content Security Policy that disallows inline scripts in the WordPress admin interface to blunt payload execution.

bash

# Configuration example: verify and update the plugin via WP-CLI
wp plugin list --name=seriously-simple-podcasting --fields=name,version,status
wp plugin update seriously-simple-podcasting
wp plugin get seriously-simple-podcasting --field=version