A remote unauthorized attacker with network access via port 4307/TCP to the 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.

A remote unauthorized attacker with network access via port 4307/TCP to the 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.

A vulnerability classified as problematic was found in TrueConf Server 4.3.7. This vulnerability 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.

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 meetingroom parameter and executed when users visit the Conference Info page, allowing attackers to achieve full Account Takeover (ATO). This issue is caused by improper sanitization of user-supplied input in the meetingroom field.

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.

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).

TrueConf Client 8.5.2 is vulnerable to DLL hijacking via crafted wfapi.dll allowing local attackers to execute arbitrary code within the user's context.

TrueConf Client contains a download of code without integrity check vulnerability. An attacker who is able to influence the update delivery path can substitute a tampered update payload. If the payload is executed or installed by the updater, this may result in arbitrary code execution in the context of the updating process or user.

Check Point says attackers exploited CVE-2026-3502, a flaw in the TrueConf Windows client update validation mechanism, to push a malicious update through a trusted on-prem server and infect multiple Southeast Asian government entities. The campaign used DLL sideloading, UAC bypass, and infrastructure linked to Havoc C2, and the key artifacts to hunt for include trueconfwindowsupdate.exe, C:\ProgramData\PowerISO\poweriso.exe, 7z-x64.dll, iscsiexe.dll, and outbound activity to 43.134.90[.]60, 43.134.52[.]221, and 47.237.15[.]197. The flaw is fixed in TrueConf 8.5.3

A SQL injection issue in the web API in TrueConf Server 5.2.0.10225 (fixed in 5.2.6.10025) allows remote unauthenticated attackers to execute arbitrary SQL commands, ultimately leading to remote code execution.

A SQL injection issue in a database stored function in TrueConf Server 5.2.0.10225 (fixed in 5.2.6.10025) allows a low-privileged database user to execute arbitrary SQL commands as the database administrator, resulting in execution of arbitrary code.

A vulnerability, which was classified as problematic, was found in TrueConf Server 4.3.7. This affects an unknown part. The manipulation leads to basic cross site scripting (Stored). It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

A vulnerability has been found in TrueConf Server 4.3.7 and classified as problematic. This vulnerability affects unknown code of the file /admin/conferences/get-all-status/. The manipulation of the argument keys[] leads to basic cross site scripting (Reflected). The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

A vulnerability was found in TrueConf Server 4.3.7 and classified as problematic. This issue affects some unknown processing of the file /admin/conferences/list/. The manipulation of the argument sort leads to basic cross site scripting (Reflected). The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

A vulnerability was found in TrueConf Server 4.3.7. It has been classified as problematic. Affected is an unknown function of the file /admin/group/list/. The manipulation of the argument checkedgroupid leads to basic cross site scripting (Reflected). It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

A vulnerability was found in TrueConf Server 4.3.7. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file /admin/group. The manipulation leads to basic cross site scripting (DOM). The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

A vulnerability was found in TrueConf Server 4.3.7. It has been rated as problematic. Affected by this issue is some unknown functionality of the file /admin/conferences/list/. The manipulation of the argument domxss leads to basic cross site scripting (DOM). The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

A vulnerability classified as problematic has been found in TrueConf Server 4.3.7. This affects an unknown part of the file /admin/general/change-lang. The manipulation of the argument redirecturl leads to open redirect. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.