CVE-2025-66834

HIGHNVD 7.37.3—Trending — 3 sources updated this weekElevated

7.3

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 v3: 7.3
EG Score: 7.3(medium)
EPSS: 12.9%
KEV: Not listed

Published

December 30, 2025

Last Modified

January 7, 2026

References (3)

cve@mitrehttps://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md
cve@mitrehttps://trueconf.com
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/x00nullbit/CVE-References/blob/main/CVE-2025-66834/README.md

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-1236Improper Neutralization of Formula Elements in a CSV File

Data Freshness Timeline

(refreshed 11× in last 7d / 11× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:13 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 16:51 UTCEG score recompute
2026-05-29 16:51 UTCGHSA enrichment
2026-05-29 13:44 UTCepss_batch

Frequently asked(5)

What is CVE-2025-66834?

CVE-2025-66834 is a high vulnerability published on December 30, 2025. 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.

When was CVE-2025-66834 disclosed?

CVE-2025-66834 was first published in the National Vulnerability Database on December 30, 2025, with the most recent update on January 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-66834 actively exploited?

CVE-2025-66834 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-66834?

CVE-2025-66834 has a CVSS v3 base score of 7.3 (NVD).

How do I remediate CVE-2025-66834?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-66834, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-66834

Explore →

Is Your Infrastructure Affected by CVE-2025-66834?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2025-66834

📅 Published

🔄 Last Modified

🔗 References (3)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-66834?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (3)

Frequently asked(5)

Related CVEs(same CWE)