CVE-2026-5967
Published: 20 April 2026
Summary
CVE-2026-5967 is a high-severity OS Command Injection (CWE-78) vulnerability in Teamt5 Threatsonar Anti-Ransomware. Its CVSS base score is 8.7 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 28.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-6 (Least Privilege) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2026-5967 is a privilege escalation vulnerability in ThreatSonar Anti-Ransomware, a product developed by TeamT5. The flaw enables authenticated remote attackers with shell access to inject operating system commands, which then execute with root privileges. Classified under CWE-78 (OS Command Injection), it received a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) upon publication on 2026-04-20.
Attackers require low privileges, specifically authentication and remote shell access to the affected system, to exploit this vulnerability over the network with low complexity and no user interaction. Successful exploitation allows injection and execution of arbitrary OS commands as root, resulting in high impacts to confidentiality, integrity, and availability, potentially leading to full system compromise.
Advisories from TWCERT/CC, available at https://www.twcert.org.tw/en/cp-139-10855-e6d1b-2.html and https://www.twcert.org.tw/tw/cp-132-10854-03015-1.html, provide further details on the vulnerability and mitigation guidance.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-23800
Vulnerability details
ThreatSonar Anti-Ransomware developed by TeamT5 has an Privilege Escalation vulnerability. Authenticated remote attackers with shell access can inject OS commands and execute them with root privileges.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Privilege escalation vulnerability via OS command injection (CWE-78) directly enables Exploitation for Privilege Escalation (T1068).
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents the OS command injection vulnerability in ThreatSonar by validating shell inputs to block arbitrary command execution with root privileges.
Enforces least privilege on the ThreatSonar shell process, preventing injected commands from executing with unnecessary root privileges even if injection occurs.
Remediates the specific privilege escalation flaw in ThreatSonar Anti-Ransomware through timely identification, testing, and application of vendor-provided patches.