CVE-2025-66834
HighCVSS 7.3Exploitation Probability (EPSS)
Low risk20th percentile - higher than 20% of all known CVEs
Summary
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.
Risk Assessment
An attacker could exploit this to execute malicious formulas in spreadsheets opened by victims, potentially leading to data theft or malware propagation.
Recommendation
Update TrueConf Server to a patched version or apply proper input filtering.
Other vulnerabilities in TrueConf Server
See all- CVE-2026-72530CriticalActively exploited
A remote unauthorized attacker with network access via port 4307/TCP to TrueConf server versions 5.3.X to 5.3.9, 5.4.X to 5.4.9, 5.5.X to 5.5.5, and earlier could use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system.
- CVE-2026-72529CriticalActively exploited
A remote unauthorized attacker with network access via port 4307/TCP to TrueConf server versions 5.3.X to 5.3.9, 5.4.X to 5.4.9, 5.5.X to 5.5.5, and earlier could execute an arbitrary script by calling an undocumented function.
- CVE-2025-66823Medium
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).
- CVE-2025-66824High
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. The injected payload is stored via the meeting_room parameter and executed when users visit the Conference Info page, allowing full Account Takeover (ATO).
- CVE-2017-20120Medium
A vulnerability classified as problematic was found in TrueConf Server 4.3.7. It affects unknown code of the file /admin/service/stop/. The manipulation leads to cross-site request forgery. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
Original NVD description (English source)
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.