CVE-2026-92761

WebVirtCloud Missing Authorization on Instance Control Actions

State: Published
Severity: 8.7 High
Published: Sep 16, 2026
Updated: Sep 21, 2026
Reserved: Sep 16, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
webvirtcloudretspen	1b2da68b2800f94674dd96f4a986cde30ac88280Affected

References

GitHub Issue #682issue-tracking
https://github.com/retspen/webvirtcloudproduct
get_instance checks only that a grant exists, not its flagstechnical-description
poweroff authorizes with get_instance alonetechnical-description
resizevm_cpu shows the intended is_change enforcementtechnical-description
VulnCheck Advisory: WebVirtCloud Missing Authorization on Instance Control Actionsthird-party-advisory

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