High severity · published Dec 30, 2025
CVE-2025-66834
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…
7.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TS
Trueconf Server · Trueconf
5.5.2.10813 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66834
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66834
Exploit
https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md
Product
https://trueconf.com
More from Trueconf Server
9.8
CVE-2026-72529
TrueConf Server Missing Authentication for Critical Function Vulnerability
9.0
CVE-2026-72530
TrueConf Server Code Injection Vulnerability
8.8
CVE-2017-20120
A vulnerability classified as problematic was found in TrueConf Server 4.3.7
8.7
CVE-2025-66824
A Stored Cross-Site Scripting (XSS) vulnerability exists in the Meeting location field of the Create/Edit Conference functionality in TrueConf Server v5.5.2.10813
5.4
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…