CVE-2026-84934: CWE-79 Cross-Site Scripting (XSS) in JCH Optimize
Description
The JCH Optimize WordPress plugin before 6.0.1 does not perform a capability check on one of its authenticated AJAX actions and lets the request choose which internal action runs, allowing any authenticated users such as Subscribers to import arbitrary JCH Optimize WordPress plugin before 6.0.1 settings and store a script that executes in the browser of any visitor or administrator viewing the site.
CVSS v3.1
Score 8.0high
Affected software
JCH Optimize
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-84934 is a CWE-79 Cross-Site Scripting vulnerability in the JCH Optimize WordPress plugin prior to version 6.0.1. The vulnerability occurs due to missing capability checks on an authenticated AJAX action, which permits any authenticated user to select internal actions and import arbitrary plugin settings. This can result in stored XSS, where malicious scripts execute in the context of users viewing the site, including administrators.
Potential Impact
An attacker with any authenticated user privileges (such as Subscriber role) can exploit this vulnerability to store malicious scripts within the plugin settings. These scripts execute in the browsers of site visitors or administrators, potentially leading to account compromise, session hijacking, or other malicious actions. The CVSS score of 8 indicates high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
No official patch or remediation guidance is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, restrict authenticated user roles to trusted users only and monitor for suspicious activity related to plugin settings import actions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-02T16:26:43.553Z
- State
- PUBLISHED
Threat ID: 6a9bb8bbacd9273b49723e0e
Added to database: 09/05/2026, 06:37:47 UTC
Last enriched: 09/07/2026, 11:15:27 UTC
Last updated: 10/20/2026, 18:48:24 UTC
Views: 80
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