CVE-2026-92761

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.

Affected Software

Weaknesses

• CWE-862: Missing Authorization

References

• https://github.com/retspen/webvirtcloud/issues/682
• https://github.com/retspen/webvirtcloud
• https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30ac88280/instances/views.py#L316-L330
• https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30ac88280/instances/views.py#L356-L363
• https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30ac88280/instances/views.py#L538-L546
• https://www.vulncheck.com/advisories/webvirtcloud-missing-authorization-on-instance-control-actions

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