How severe is CVE-2025-66823?

CVE-2025-66823 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-66823 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66823?

CVE-2025-66823 affects Trueconf Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66823?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-66823 have an EU (EUVD) identifier?

Yes. CVE-2025-66823 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205848.

When was CVE-2025-66823 published?

CVE-2025-66823 was published on 2025-12-30 and last updated on 2026-06-17.

CVE-2025-66823

CVE-2025-66823 is a medium-severity vulnerability in Trueconf Server with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205848
Weakness: CWE-79
Affected product: Trueconf Server
Published: 2025-12-30
Last modified: 2026-06-17

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).

Frequently asked questions

What is CVE-2025-66823?: 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).
How severe is CVE-2025-66823?: CVE-2025-66823 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-66823 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66823?: CVE-2025-66823 affects Trueconf Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66823?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66823 have an EU (EUVD) identifier?: Yes. CVE-2025-66823 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205848.
When was CVE-2025-66823 published?: CVE-2025-66823 was published on 2025-12-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:trueconf:server:5.5.2.10813:*:*:*:*:*:*:*

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