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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

Quick assessment

Affected
foxtheme Foxtool All-in-One: Contact chat button, Custom login, Media optimize images
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-18317

Vulnerability Information

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Vulnerability Title
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
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
foxtheme Foxtool All-in-One: Contact chat button, Custom login, Media optimize images 0 ~ 2.5.3 -

II. Public POCs for CVE-2026-18317

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III. Intelligence Information for CVE-2026-18317

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Other References for CVE-2026-18317 (2)

IV. Related Vulnerabilities

Same product: Foxtool All-in-One: Contact chat button, Custom login, Media optimize images
Same vendor: foxtheme
Same weakness: CWE-862

V. Comments for CVE-2026-18317

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