CVE-2026-40229 Helpy 2.8.0 - Stored XSS in post author display via PostsHelper

Medium 5.1 Published 29 Apr 2026 Updated 29 Apr 2026

A stored XSS vulnerability in Helpy allows registered users to inject malicious scripts via their account name, affecting public views and emails.

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-2026-40229?

CVE-2026-40229 is a medium-severity cross-site scripting vulnerability in helpyio helpy, published on 29 Apr 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

Helpy contains a stored cross-site scripting vulnerability in the post author display logic. Any registered user can persist arbitrary HTML in their account name field and cause it to be rendered unescaped in public forum threads where they participate, in the admin ticket view, and in HTML notification emails sent to other users.This issue affects helpy: 2.8.0.

Weakness: CWE-79

Which versions are affected by CVE-2026-40229?

It affects 1 product.

Products include Helpy.io Helpy.

How do I fix CVE-2026-40229?

No fix has been published for CVE-2026-40229 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-2026-40229 being exploited?

There is no known exploitation of CVE-2026-40229 in the wild and no public exploit code.

Sources

Also known as GHSA-qxjc-9q88-9cgh.