CVE-2026-25438 Cross-site scripting in Gutenberg Blocks
An attacker can execute arbitrary scripts in the victim's browser via reflected XSS in the Gutenberg Blocks plugin.
- 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-2026-25438?
CVE-2026-25438 is a high-severity cross-site scripting vulnerability in ThemeHunk Gutenberg Blocks, published on 19 Mar 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 ThemeHunk Gutenberg Blocks unlimited-blocks allows Reflected XSS.This issue affects Gutenberg Blocks: from n/a through <= 1.2.8.
Weakness: CWE-79
Which versions are affected by CVE-2026-25438?
How do I fix CVE-2026-25438?
No fix has been published for CVE-2026-25438 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-2026-25438 being exploited?
There is no known exploitation of CVE-2026-25438 in the wild and no public exploit code.
Sources
Also known as GHSA-phw7-5r49-8p2f.