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
Strategic Overview
- Status
- Patched in 2.5.4
- Affected Version
<= 2.5.3- CVSS
- 4.3Medium
- Weakness type
- CWE-862 · Missing Authorization
- CVE
CVE-2026-18317
At a glance
CVE-2026-18317 is a medium-severity Missing Authorization vulnerability in the Foxtool All-in-One WordPress plugin, affecting versions <= 2.5.3. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 2.5.4; sites on affected versions should update now. Disclosed September 2026, reported by Wordfence PRISM.
Vulnerability Overview
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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.
CWE-862: Missing Authorization
Reaching this weakness in Foxtool All-in-One <= 2.5.3 takes an account at Subscriber level or above. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.
Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Foxtool All-in-One the fix is 2.5.4: builds <= 2.5.3 are affected, anything from 2.5.4 onward is not.
Remediation
Update to version 2.5.4, or a newer patched version
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Foxtool All-in-One 2.5.4 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Foxtool All-in-One: Contact chat button, Custom login, Media optimize images
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C