CVE-2026-40804 WordPress aBlocks plugin <= 2.16.0 - Cross Site Scripting (XSS) vulnerability
Reflected XSS in aBlocks plugin allows attackers to inject malicious scripts into web pages viewed by other users.
- 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-2026-40804?
CVE-2026-40804 is a high-severity cross-site scripting vulnerability in Kodezen LLC aBlocks, published on 8 Oct 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
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kodezen LLC aBlocks ablocks allows Reflected XSS.This issue affects aBlocks: from n/a through 2.16.0.
Weakness: CWE-79
Which versions are affected by CVE-2026-40804?
How do I fix CVE-2026-40804?
No fix has been published for CVE-2026-40804 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-2026-40804 being exploited?
There is no known exploitation of CVE-2026-40804 in the wild and no public exploit code.
Sources
Also known as GHSA-5qw9-rh24-hw29.