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
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 foxtoolsettings option, including enabling site-wide SVG uploads by toggling the media-up3 key, which can facilitate stored cross-site scripting via malicious SVG files.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Foxtool All-in-One: Contact chat button, Custom login, Media optimize imagesto a version that resolves this vulnerability.Fixed in 2.5.3 - Compensating control
Restrict WordPress authenticated access so only trusted roles (above Subscriber+) can access or trigger the affected Foxtool AJAX functionality that modifies the foxtool_settings option subkeys (e.g., prevent Subscriber+ users from reaching the toggle_watermark AJAX action).
- Operational
Review and remediate any SVG files uploaded as a result of enabling site-wide SVG uploads (e.g., investigate the media-up3-related setting/subkeys in foxtool_settings and remove any malicious SVGs).
Event History
Frequently Asked Questions
Who can exploit this issue?
An attacker must be authenticated to the affected WordPress site with at least Subscriber-level access. No user interaction is required for the settings-modification action.
What configuration change can an attacker make?
An attacker can modify arbitrary subkeys of the foxtool_settings option through the toggle_watermark AJAX action's option_key parameter. One documented impact is enabling site-wide SVG uploads by toggling the media-up3 setting.
What is the likely impact of enabling SVG uploads?
Allowing SVG uploads can facilitate stored cross-site scripting if a malicious SVG file is uploaded and later viewed or rendered by the site. The provided severity vector rates confidentiality impact as none, integrity impact as low, and availability impact as none.
Which installations should be considered affected?
All versions of the Foxtool plugin up to and including 2.5.3 are affected. The issue applies where an attacker can obtain or use an authenticated WordPress account with Subscriber-level or greater permissions.