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Vulnerability record · CVE-2025-66834 · published 30 December 2025

CVE-2025-66834: Trueconf server csv injection vulnerability

Trueconf · Trueconf Server

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.

7.3 CVSS 3.1 High EPSS 0.31% · top 78.4% CWE-1236 · CSV injection
7.3CVSS 3.1 base score
0.31%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
20 Aug 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md ExploitThird Party Advisory
https://trueconf.com Product
https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.5CVE-2026-72530TrueConf Server sandbox breakout via crafted script code injectionTrueConf Server versions 5.3.X through 5.3.9, 5.4.X through 5.4.9, 5.5.X through 5.5.5 and earlier allow a remote unauthenticated attacker to break o…KEVEPSS 1.7%analysed9.3CVE-2026-72529TrueConf Server missing authentication allows remote script executionTrueConf Server versions 5.3.X through 5.3.9, 5.4.X through 5.4.9, 5.5.X through 5.5.5, and earlier expose an undocumented function on port 4307/TCP …KEVEPSS 1.5%analysed8.8CVE-2017-20120Trueconf server cross-site request forgery vulnerabilityA vulnerability classified as problematic was found in TrueConf Server 4.3.7. This vulnerability affects unknown code of the file /admin/service/stop…EPSS 0.49%8.7CVE-2025-66824Trueconf server cross-site scripting vulnerabilityA Stored Cross-Site Scripting (XSS) vulnerability exists in the Meeting location field of the Create/Edit Conference functionality in TrueConf Server…EPSS 0.31%5.4CVE-2025-66823Trueconf server cross-site scripting vulnerabilityAn HTML Injection vulnerability in TrueConf server 5.5.2.10813 in the conference description field allows an attacker to inject arbitrary HTML in the…EPSS 0.19%

Source: NIST National Vulnerability Database (record CVE-2025-66834), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.