CVE-2025-66834

HIGH

Published Dec 30, 2025 Modified Jan 7, 2026 CWE-1236

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.

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CVSS v3.1 Score

7.3

HIGH

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

Weakness Type (CWE)

CWE-1236 CWE-1236

Affected Products

Vendor	Product	Versions
trueconf	server	All

References

Exploits

https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md

Other References

https://trueconf.com

Frequently Asked Questions

What is 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 Name. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2025-66834? +

CVE-2025-66834 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-66834? +

CVE-2025-66834 affects products from trueconf, specifically: server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66834? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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