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CVE-2026-23559 is an authorization flaw in XAPI Role Based Access Control affecting the handling of the VBD.other_config:backend-local setting. A user with the lower-privileged vm-admin role can set this parameter even though the capability should be restricted to a more privileged administrative role. By doing so, the attacker can cause arbitrary files in dom0, the Xen control domain, to be treated as VDIs and attached as virtual disks to a VM under the attacker’s control. This breaks the intended RBAC boundary between guest administrators and the host control domain and enables unauthorized access to host-resident files.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical privilege-escalation vulnerability in XAPI for XCP-ng/Citrix XenServer that allows a user with vm-admin or similar RBAC privileges to escalate to root in dom0 via writable Map(String,String) fields.
Privilege/authorization weakness in XAPI RBAC allowing a vm-admin to set VBD.other_config:backend-local, exposing arbitrary dom0 files as virtual disks and enabling arbitrary read and/or modification of files in dom0.
A privilege-related access control flaw in XAPI/XenServer RBAC where a vm-admin can set VBD.other_config:backend-local to expose arbitrary dom0 files as virtual disks, enabling arbitrary read and/or modification of files in dom0.
Privilege/authorization weakness in XAPI RBAC allowing a vm-admin to set VBD.other_config:backend-local, exposing arbitrary dom0 files as virtual disks and enabling arbitrary read and/or modification of files in dom0.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.