VulnerabilityBleeping Computer
7.8 — HIGH
Hackers breach TrueConf to trojanize client installers with backdoors
The Head Mare hacktivist group has been exploiting vulnerabilities in unpatched TrueConf video conferencing servers to replace client installers with malicious versions that deliver backdoors. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
The Head Mare hacktivist group has breached TrueConf video conferencing servers, replacing client installers with backdoors that deliver persistent remote access and exfiltrate sensitive information. The attack leverages unpatched vulnerabilities in TrueConf Server versions before 5.3.9, 5.4.9, and 5.5.5.
⚙️Technical Details
CVEs
CVE-2026-3502
Affected Systems
Trueconf Trueconf
Attack Vectors
ADJACENT_NETWORK
💥Impact Assessment
Severity: High
🛡️Recommended Actions
1Ensure all TrueConf Server versions are patched with the latest updates (5.3.9, 5.4.9, and 5.5.5) released on June 18.
2Disable TCP port 4307 to prevent unauthorized connections to the server.
3Implement regular security audits and vulnerability scans to detect potential attacks.
📦Affected Products
Trueconf Trueconf
🔐NVD Verified DataVERIFIED
CVE-2026-3502 ↗CVSS 7.8 — HIGH
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:LWeaknesses
CWE-494
Affected Products (CPE)
Trueconf Trueconf
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