# CVE-2026-5966: TeamT5 ThreatSonar Anti-Ransomware arbitrary file deletion via path traversal

Source: https://junglewise.ai/threats/cve-2026-5966-teamt5-threatsonar-anti-ransomware-arbitrary-file-deletion-via  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-20. Updated: 2026-05-14  
License: CC BY 4.0 with a link back

CVE-2026-5966 · Severity: high · CVSS 8.1 · Published 2026-04-20

TeamT5 ThreatSonar Anti-Ransomware, a security solution designed to protect organizations from ransomware attacks, contains a vulnerability that allows for unauthorized file deletion. An authenticated attacker with web access can exploit this flaw to delete critical system files. This could lead to significant service disruptions, loss of security logs, or the disabling of the anti-ransomware protection itself.

Technologies: [TeamT5 ThreatSonar Anti-Ransomware](https://junglewise.ai/threats/technologies/threatsonar-anti-ransomware). Vendors: [TeamT5](https://junglewise.ai/threats/vendors/teamt5).

## Quick answers

**Is CVE-2026-5966 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5966 being exploited in the wild.

**How severe is CVE-2026-5966?** High severity, with a CVSS score of 8.1, published 20 April 2026.

**Which products and versions are affected?** TeamT5 ThreatSonar Anti-Ransomware versions up to (excluding) 4.0.0.

**Is there a fix for CVE-2026-5966?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-5966 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-5966?** Check whether you run TeamT5 ThreatSonar Anti-Ransomware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An arbitrary file deletion vulnerability exists in TeamT5 ThreatSonar Anti-Ransomware due to improper limitation of a pathname to a restricted directory (CWE-22/CWE-23). An authenticated remote attacker with web access can provide specially crafted input containing path traversal sequences (e.g., ../) to target and delete files outside of the intended directory. Successful exploitation allows the attacker to delete arbitrary files on the underlying system, potentially leading to a denial-of-service condition or the removal of critical security configurations. The vulnerability is addressed in version 4.0.0.

## Affected products

- TeamT5 ThreatSonar Anti-Ransomware versions up to (excluding) 4.0.0

## Timeline

- 2026-04-20: disclosed
- 2026-04-20: advisory

## References

- [https://www.twcert.org.tw/en/cp-139-10832-05f3a-2.html](https://www.twcert.org.tw/en/cp-139-10832-05f3a-2.html)
- [https://www.twcert.org.tw/tw/cp-132-10831-a734d-1.html](https://www.twcert.org.tw/tw/cp-132-10831-a734d-1.html)

## Related threats

- [TeamT5 ThreatSonar Anti-Ransomware privilege escalation via OS command injection](https://junglewise.ai/threats/cve-2026-5967-teamt5-threatsonar-anti-ransomware-privilege-escalation-via-os)
- [TeamT5 ThreatSonar Anti-Ransomware unrestricted file upload](https://junglewise.ai/threats/cve-2024-7694-teamt5-threatsonar-anti-ransomware-unrestricted-file-upload)