PT-2025-54212 · Trueconf · Trueconf Server

X00Nullbit · Published 2025-12-30 · Updated 2026-01-02 · CVE-2025-66834

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions TrueConf Server version 5.5.2.10813

Description A CSV Formula Injection issue exists in TrueConf Server. A standard user can inject harmful spreadsheet formulas into exported chat logs by using a specially crafted Display Name. The vulnerability allows for the injection of malicious formulas when exporting chat logs.

Recommendations Update to a newer version that contains a fix for this vulnerability. As a temporary workaround, sanitize the Display Name field to prevent the injection of spreadsheet formulas.

Exploit

Fix

RCE

Weakness Enumeration

CWE-1236

Related Identifiers

BDU:2026-04923

CVE-2025-66834

Affected Products

Trueconf Server

References · 9

• 🔥 https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-66834 · Security Note
• https://bdu.fstec.ru/vul/2026-04923 · Security Note
• https://osv.dev/vulnerability/CVE-2025-66834 · Vendor Advisory
• https://trueconf.ru/blog/update/trueconf-server-5-5-3 · Note
• https://t.me/CVEtracker/40990 · Telegram Post
• https://t.me/cveNotify/147529 · Telegram Post
• https://trueconf.com · Note
• https://twitter.com/CVEnew/status/2006861552037532152 · Twitter Post