CVE Catalog

CVE-2026-92761

HighCVSS 8.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.44%

38th percentile - higher than 38% of all known CVEs

Summary

WebVirtCloud fails to properly validate permission flags in UserInstance grants, allowing view-only users to perform privileged actions. Attackers with read-only grants can power off virtual machines, reset root passwords, install SSH keys, and manage ISO images by exploiting the get_instance gate that only checks grant existence.

Risk Assessment

A read-only user can take control of virtual machines, including resetting root passwords and installing their own SSH keys, leading to full system takeover.

Recommendation

Upgrade WebVirtCloud to a patched version and verify that the get_instance gate checks specific permission flags rather than just grant existence.

Related vulnerabilities

Original NVD description (English source)

WebVirtCloud fails to properly validate permission flags in UserInstance grants, allowing view-only users to perform privileged actions. Attackers with read-only grants can power off virtual machines, reset root passwords, install SSH keys, and manage ISO images by exploiting the get_instance gate that only checks grant existence.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS