CVE-2026-92761Public exploitNetwork attack vectorHinoki check available

Virtual machine takeover via unchecked grant flags

Published Sep 16, 2026 · Updated Sep 21, 2026

Missing authorization in WebVirtCloud commit 1b2da68 allows remote authenticated users with read-only grants to control virtual machines. The get_instance gate verifies only that a UserInstance grant exists and ignores its is_change, is_delete, and is_vnc permission flags. A read-only grant is sufficient to power off a guest, reset its root password, install an SSH key, manage ISO media, or detach disks.

CVSS severity8.7
High
EPSS probability0.61%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authorization in WebVirtCloud commit 1b2da68 allows remote authenticated users with read-only grants to control virtual machines. The get_instance gate verifies only that a UserInstance grant exists and ignores its is_change, is_delete, and is_vnc permission flags. A read-only grant is sufficient to power off a guest, reset its root password, install an SSH key, manage ISO media, or detach disks.

The record

CVE
CVE-2026-92761
Published
Sep 16, 2026
Updated
Sep 21, 2026
Vendor
retspen
Product
WebVirtCloud
Classifications
CWE-862, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1b2da68b2800f94674dd96f4a986cde30ac88280

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

retspen · WebVirtCloudversion=1b2da68b2800f94674dd96f4a986cde30ac88280

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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