CVE-2025-53858 Cross-site scripting in ChatLuck
An attacker can execute arbitrary scripts in the browser of users accessing ChatLuck chat rooms, potentially compromising user sessions.
- 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-2025-53858?
CVE-2025-53858 is a medium-severity cross-site scripting vulnerability in NEOJAPAN Inc. ChatLuck, published on 16 Oct 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
ChatLuck contains a cross-site scripting vulnerability in Chat Rooms. If exploited, an arbitrary script may be executed on the web browser of the user who is accessing the product.
Weakness: CWE-79
Which versions are affected by CVE-2025-53858?
How do I fix CVE-2025-53858?
No fix has been published for CVE-2025-53858 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-2025-53858 being exploited?
There is no known exploitation of CVE-2025-53858 in the wild and no public exploit code.
Sources
Also known as GHSA-58f5-cq94-jm2j.