CVE-2025-66834
TrueConf Server Formula Injection Vulnerability
Description
A CSV Formula Injection vulnerability in TrueConf Server v5.5.2.10813 allows a normal user to inject malicious spreadsheet formulas into exported chat logs via crafted Display Name.
INFO
Published Date :
Dec. 30, 2025, 7:15 p.m.
Last Modified :
Jan. 7, 2026, 3:39 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Validate and sanitize user-supplied display names.
- Avoid direct formula interpretation in exported CSV files.
- Update TrueConf Server to a patched version if available.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-66834.
| URL | Resource |
|---|---|
| https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md | Exploit Third Party Advisory |
| https://trueconf.com | Product |
| https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md | Exploit Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-66834 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-66834
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-66834 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-66834 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 07, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:trueconf:server:5.5.2.10813:*:*:*:*:*:*:* Added Reference Type CISA-ADP: https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md Types: Exploit, Third Party Advisory Added Reference Type MITRE: https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md Types: Exploit, Third Party Advisory Added Reference Type MITRE: https://trueconf.com Types: Product -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jan. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N Added CWE CWE-1236 Added Reference https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md -
New CVE Received by [email protected]
Dec. 30, 2025
Action Type Old Value New Value Added Description A CSV Formula Injection vulnerability in TrueConf Server v5.5.2.10813 allows a normal user to inject malicious spreadsheet formulas into exported chat logs via crafted Display Name. Added Reference https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md Added Reference https://trueconf.com