CVE-2026-88824 Master Blocks 1.4.1 - 1.4.1.4 - Unauthenticated Stored XSS via White Label Settings
Unauthenticated attackers can inject malicious scripts via settings, leading to stored XSS and potential admin account takeover.
- 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-2026-88824?
CVE-2026-88824 is a high-severity cross-site scripting vulnerability in Unknown Master Blocks, published on 19 Sep 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 Master Blocks WordPress plugin before 1.5.0 does not have authorisation on one of its REST routes, allowing unauthenticated users to update its settings, including a value that is output unescaped in the admin area, leading to Stored XSS that executes in the session of any administrator visiting a wp-admin page.
Weakness: CWE-79
Which versions are affected by CVE-2026-88824?
How do I fix CVE-2026-88824?
No fix has been published for CVE-2026-88824 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-2026-88824 being exploited?
There is no known exploitation of CVE-2026-88824 in the wild and no public exploit code.
Sources
Also known as GHSA-4qrp-9fm8-gvg2.