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CVE-2026-9125: The Ultimate Video Player For WordPress <= 4.2.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'link_url' Shortcode Attribute

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-12 · updated 2026-08-28
• Weakness: CWE-79

Description

The Presto Player plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'link_url' parameter of the [presto_player_overlay] 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 link_url 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 products

• 2winfactor Presto Player: through 4.2.0

References

• https://plugins.trac.wordpress.org/browser/presto-player/tags/4.1.1/dist/components/collection/components/core/features/presto-dynamic-overlays/component/presto-dynamic-overlays.js#L1
• https://plugins.trac.wordpress.org/browser/presto-player/tags/4.1.1/inc/Services/Shortcodes.php#L464
• https://plugins.trac.wordpress.org/browser/presto-player/tags/4.1.1/inc/Services/Shortcodes.php#L513
• https://plugins.trac.wordpress.org/browser/presto-player/tags/4.1.1/templates/video.php#L16
• https://plugins.trac.wordpress.org/browser/presto-player/tags/4.1.4/dist/components/collection/components/core/features/presto-dynamic-overlays/component/presto-dynamic-overlays.js#L1
• https://plugins.trac.wordpress.org/browser/presto-player/tags/4.1.4/inc/Services/Shortcodes.php#L464
• https://plugins.trac.wordpress.org/browser/presto-player/tags/4.1.4/inc/Services/Shortcodes.php#L513
• https://plugins.trac.wordpress.org/browser/presto-player/tags/4.1.4/templates/video.php#L16
• https://plugins.trac.wordpress.org/changeset/3553268/presto-player/trunk/inc/Services/Shortcodes.php
• https://research.cleantalk.org/cve-2026-9125/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/c87e7f50-f14a-4751-abcb-3a5bdd214889?source=cve

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