CVE-2026-55621: CWE-284: Improper Access Control in lxc incus
Incus, a system container and virtual machine manager, has an improper access control vulnerability prior to version 7.2.0. This flaw allows attackers who know the name of a project and a custom volume within it, but lack access rights, to copy that custom volume to a new project. This could lead to unauthorized access to secrets stored in those custom volumes. The issue is fixed in version 7.2.0.
AI Analysis
Technical Summary
CVE-2026-55621 describes an improper access control vulnerability (CWE-284) in Incus before version 7.2.0. The vulnerability arises from missing authorization checks during custom volume copying operations. An attacker with knowledge of a project name and a custom volume name within that project, but without legitimate access, can copy the volume to a project they control. This unauthorized copying can expose sensitive secrets contained in the custom volumes. The vulnerability has a CVSS 3.1 score of 7.7, indicating high severity, with network attack vector, low attack complexity, requiring low privileges, no user interaction, and resulting in high confidentiality impact without affecting integrity or availability. The issue is patched in Incus version 7.2.0.
Potential Impact
An attacker with low privileges and knowledge of project and volume names can bypass authorization controls to copy custom volumes from projects they do not have access to. This can lead to unauthorized disclosure of sensitive secrets stored in those volumes. There is no impact on integrity or availability. The vulnerability is rated high severity due to the potential confidentiality breach.
Mitigation Recommendations
Upgrade Incus to version 7.2.0 or later, where this improper access control vulnerability is patched. Patch status is confirmed by the vendor stating the issue is fixed in version 7.2.0. No other mitigation is indicated.
CVE-2026-55621: CWE-284: Improper Access Control in lxc incus
Description
Incus, a system container and virtual machine manager, has an improper access control vulnerability prior to version 7.2.0. This flaw allows attackers who know the name of a project and a custom volume within it, but lack access rights, to copy that custom volume to a new project. This could lead to unauthorized access to secrets stored in those custom volumes. The issue is fixed in version 7.2.0.
CVSS v3.1
Score 7.7high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-55621 describes an improper access control vulnerability (CWE-284) in Incus before version 7.2.0. The vulnerability arises from missing authorization checks during custom volume copying operations. An attacker with knowledge of a project name and a custom volume name within that project, but without legitimate access, can copy the volume to a project they control. This unauthorized copying can expose sensitive secrets contained in the custom volumes. The vulnerability has a CVSS 3.1 score of 7.7, indicating high severity, with network attack vector, low attack complexity, requiring low privileges, no user interaction, and resulting in high confidentiality impact without affecting integrity or availability. The issue is patched in Incus version 7.2.0.
Potential Impact
An attacker with low privileges and knowledge of project and volume names can bypass authorization controls to copy custom volumes from projects they do not have access to. This can lead to unauthorized disclosure of sensitive secrets stored in those volumes. There is no impact on integrity or availability. The vulnerability is rated high severity due to the potential confidentiality breach.
Mitigation Recommendations
Upgrade Incus to version 7.2.0 or later, where this improper access control vulnerability is patched. Patch status is confirmed by the vendor stating the issue is fixed in version 7.2.0. No other mitigation is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T23:31:22.446Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8869e9acd9273b494e473b
Added to database: 08/21/2026, 15:08:25 UTC
Last enriched: 08/21/2026, 15:22:43 UTC
Last updated: 08/21/2026, 15:30:15 UTC
Views: 4
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