Quick answers
- Is CVE-2025-66823 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-66823 being exploited in the wild.
- How severe is CVE-2025-66823?
- Medium severity, with a CVSS score of 5.4, published 30 December 2025.
- Which products and versions are affected?
- TrueConf Server 5.5.2.10813.
- Is there a fix for CVE-2025-66823?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2025-66823 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2025-66823?
- Check whether you run TrueConf Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an HTML injection (CWE-79) in TrueConf Server's conference description field that results from insufficient input sanitization. An authenticated attacker can inject specially crafted HTML, such as invisible anchor tags with CSS classes (conference-routes-container and router-container), which overlay the entire page. When rendered in the Conference Info page, any user click triggers a redirect to an attacker-controlled site. The attack requires conference creation/edit privileges and user interaction (clicking), but does not require additional authentication per click. No patch availability is documented in the advisory.
Affected products
- TrueConf Server 5.5.2.10813
Timeline
- 2025-11-23: disclosed: Vulnerability discovered
- 2025-12-30: advisory: CVE-2025-66823 published