CVE-2026-10083 APCu Manager < 4.5.0 - Unauthenticated Stored XSS via Cache Key Pollution
Unauthenticated attackers can inject malicious scripts into APCu cache keys, leading to stored XSS and potential admin account takeover in WordPress.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-10083?
CVE-2026-10083 is a high-severity cross-site scripting vulnerability in Unknown APCu Manager, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The APCu Manager WordPress plugin before 4.5.0 does not escape APCu object-cache keys before rendering them in an admin-area page, leading to a Stored Cross-Site Scripting vulnerability. When a persistent object cache is enabled, cache keys derived from unsanitised user input (e.g. a transient name created by another APCu Manager WordPress plugin before 4.5.0 from an unauthenticated request) are output without escaping and execute arbitrary JavaScript in the session of an administrator viewing the page.
Which versions are affected by CVE-2026-10083?
How do I fix CVE-2026-10083?
No fix has been published for CVE-2026-10083 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-2026-10083 being exploited?
There is no known exploitation of CVE-2026-10083 in the wild and no public exploit code.
Sources
Also known as GHSA-p975-px59-fhr4.