CVE-2026-84934 JCH Optimize < 6.0.1 - Subscriber+ Stored XSS via getcacheinfo Task Override
Authenticated users can inject scripts via AJAX actions, leading to stored XSS that executes in admin browsers, potentially enabling account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-84934?
CVE-2026-84934 is a high-severity cross-site scripting vulnerability in Unknown JCH Optimize, published on 5 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-84934?
How do I fix CVE-2026-84934?
No fix has been published for CVE-2026-84934 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-84934 being exploited?
There is no known exploitation of CVE-2026-84934 in the wild and no public exploit code.
Sources
Also known as GHSA-gpfv-rv3h-8jx7.