CVE-2018-25249 MyBB My Arcade Plugin 1.3 Persistent XSS via Comment
Authenticated users can inject malicious scripts via arcade game score comments, leading to persistent XSS attacks against other users.
- 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-2018-25249?
CVE-2018-25249 is a medium-severity cross-site scripting vulnerability in MyBB My Arcade Plugin, published on 4 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
MyBB My Arcade Plugin 1.3 contains a persistent cross-site scripting vulnerability that allows authenticated users to inject malicious scripts through arcade game score comments. Attackers can add crafted HTML and JavaScript payloads in the comment field that execute when other users view or edit the comment.
Weakness: CWE-79
Which versions are affected by CVE-2018-25249?
It affects 1 product.
Products include Mybb My Arcade.
How do I fix CVE-2018-25249?
No fix has been published for CVE-2018-25249 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-2018-25249 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25249 exists.
Sources
Also known as GHSA-4mc8-7jpg-4r7r.