CVE-2026-92761
WebVirtCloud Missing Authorization on Instance Control Actions
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-862 |
| Vendor | retspen |
| Product | webvirtcloud |
| Published | Sep 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
retspen / webvirtcloud
1b2da68b2800f94674dd96f4a986cde30ac88280
References
github.com: https://github.com/retspen/webvirtcloud/issues/682 github.com: https://github.com/retspen/webvirtcloud github.com: https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30ac88280/instances/views.py#L316-L330 github.com: https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30ac88280/instances/views.py#L356-L363 github.com: https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30ac88280/instances/views.py#L538-L546 vulncheck.com: https://www.vulncheck.com/advisories/webvirtcloud-missing-authorization-on-instance-control-actions
Credits
George Chen