CVE-2026-9125: The Ultimate Video Player For WordPress <= 4.2.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'link_url' Shortcode Attribute
The Presto Player plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'linkurl' parameter of the [prestoplayeroverlay] shortcode in versions up to, and including, 4.2.0 This is due to insufficient input sanitization and output escaping in the getOverlays() function, which copies the linkurl shortcode attribute directly into the overlay configuration without scheme validation, allowing javascript: URIs to survive and be rendered as the href of a clickable anchor element by the presto-dynamic-overlay-ui web component. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
WordPress Presto Player plugin (presto_player_overlay shortcode)to a version that resolves this vulnerability.Fixed in 4.2.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-9125?
CVE-2026-9125 has a medium severity rating of 6.4.
How do I fix CVE-2026-9125?
To fix CVE-2026-9125, update the Presto Player plugin to version 4.2.1 or later.
What type of vulnerability is CVE-2026-9125?
CVE-2026-9125 is a Stored Cross-Site Scripting (XSS) vulnerability.
Which WordPress plugin is affected by CVE-2026-9125?
CVE-2026-9125 affects the Presto Player plugin for WordPress.
What causes CVE-2026-9125?
CVE-2026-9125 is caused by insufficient input sanitization and output escaping in the plugin's shortcode functionality.