CVE-2025-66823 Cross-site scripting in n/a

Low 3.5 Published 30 Dec 2025 Updated 2 Jan 2026

Attackers can inject arbitrary HTML into conference descriptions, leading to script execution when victims view the conference info page.

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-2025-66823?

CVE-2025-66823 is a low-severity cross-site scripting vulnerability in n/a, published on 30 Dec 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

An HTML Injection vulnerability in TrueConf server 5.5.2.10813 in the conference description field allows an attacker to inject arbitrary HTML in the Create/Edit conference functionality. The payload will be triggered when the victim opens the Conference Info page ([conference url]/info).

Weakness: CWE-79

Which versions are affected by CVE-2025-66823?

It affects 1 product.

Products include Trueconf Trueconf Server.

How do I fix CVE-2025-66823?

No fix has been published for CVE-2025-66823 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-2025-66823 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66823 exists.

Sources

Also known as GHSA-86hp-crvx-3qvr.