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CERTFR-2026-AVI-0510
Vulnerability from certfr_avis - Published: 2026-04-29 - Updated: 2026-04-29
De multiples vulnérabilités ont été découvertes dans Citrix XenServer. Certaines d'entre elles permettent à un attaquant de provoquer une élévation de privilèges, un déni de service à distance et un contournement de la politique de sécurité.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "XenServer versions 8.4 sans le dernier correctif de s\u00e9curit\u00e9",
"product": {
"name": "XenServer",
"vendor": {
"name": "Citrix",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-23559",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23559"
},
{
"name": "CVE-2026-23558",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23558"
},
{
"name": "CVE-2025-54505",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-54505"
},
{
"name": "CVE-2026-23556",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23556"
},
{
"name": "CVE-2026-23561",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23561"
},
{
"name": "CVE-2026-23560",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23560"
}
],
"initial_release_date": "2026-04-29T00:00:00",
"last_revision_date": "2026-04-29T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0510",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-04-29T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
},
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Citrix XenServer. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges, un d\u00e9ni de service \u00e0 distance et un contournement de la politique de s\u00e9curit\u00e9.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Citrix XenServer",
"vendor_advisories": [
{
"published_at": "2026-04-28",
"title": "Bulletin de s\u00e9curit\u00e9 Citrix CTX696527",
"url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696527\u0026articleURL=XenServer_Security_Update_for_Multiple_Issues"
}
]
}
CVE-2025-54505 (GCVE-0-2025-54505)
Vulnerability from cvelistv5 – Published: 2026-04-27 15:16 – Updated: 2026-04-29 03:04
VLAI
EPSS
VEX
Summary
A transient execution vulnerability within AMD CPUs may allow a local user-privileged attacker to leak data via the floating point divisor unit, potentially resulting in loss of confidentiality.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1420 - Exposure of Sensitive Information during Transient Execution
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| AMD | AMD EPYC™ 7001 Series Processors |
Unaffected:
OS update
|
|
| AMD | AMD EPYC™ Embedded 3000 Series Processors |
Unaffected:
OS Update
|
Date Public
2026-04-27 15:15
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CVE-2026-23556 (GCVE-0-2026-23556)
Vulnerability from cvelistv5 – Published: 2026-07-09 14:48 – Updated: 2026-07-09 15:37
VLAI
EPSS
VEX
Title
oxenstored keeps quota related use counts across domain destruction
Summary
When oxenstored is tearing a domain down, the node data is cleaned up
but the usage counts are leaked.
When the domain ID is eventually reused, the new domain can create fewer
nodes before beeing deemed to be over quota.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-281 - Improper preservation of permissions
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Xen | oxenstored |
Affected:
all
|
Credits
This issue was discovered by Andrii Sultanov of Vates.
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CVE-2026-23558 (GCVE-0-2026-23558)
Vulnerability from cvelistv5 – Published: 2026-05-19 12:49 – Updated: 2026-05-20 03:55
VLAI
EPSS
VEX
Title
grant table v2 race in status page mapping
Summary
The adjustments made for XSA-379 as well as those subsequently becoming
XSA-387 still left a race window, when a HVM or PVH guest does a grant
table version change from v2 to v1 in parallel with mapping the status
page(s) via XENMEM_add_to_physmap. Some of the status pages may then be
freed while mappings of them would still be inserted into the guest's
secondary (P2M) page tables.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
Date Public
2026-04-28 12:00
Credits
This issue was discovered by Claude Opus 4.6 and diagnosed as a security
issue by Rafal Wojtczuk.
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CVE-2026-23559 (GCVE-0-2026-23559)
Vulnerability from cvelistv5 – Published: 2026-07-09 15:09 – Updated: 2026-07-09 16:02
VLAI
EPSS
VEX
Title
Multiple RBAC issues in XAPI
Summary
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]
XAPI can configure different users with different roles, using Role
Based Access Control. For more details, see:
https://docs.xenserver.com/en-us/xencenter/current-release/rbac-overview.html#rbac-roles
The pool-admin role is fully privileged. Notably, users with this role
can also SSH into the host as root.
The other administrator roles are pool-operator, vm-power-admin and
vm-admin, each of which are authorised to configure and manage various
aspects of the system.
Some settings are inadequately restricted, and can be set by a lower
privilege of administrator than expected.
* CVE-2026-23559: A vm-admin can set VBD.other_config:backend-local and
turn arbitrary files in dom0 into VDIs (virtual disks) and give said
disks to a VM they control. This is an arbitrary read and/or modify
of files in dom0.
* CVE-2026-23560: A vm-admin can set VM.other-config:is_system_domain
and mark a VM as a system domain. System domains are ignored and
left running during certain other host/pool operations, and may be
hidden from view in tooling.
* CVE-2026-23561: A vm-admin can set VM.other_config:storage_driver_domain
and mark a VM as the storage domain for a particular host storage
connection (PBD). Shutting down the VM can cause the PBD to be
erroneously marked as unplugged when it is not.
* CVE-2026-23562: Configuration of PCI passthrough is normally
restricted to the pool-admin role. However one API was missing this
check, allowing a vm-admin access to unintended host hardware.
* CVE-2026-42486: A vm-admin can set the VM.platform:hvm_serial
parameter, which should be restricted to the pool-admin role, as it
can allow arbitrary dom0 file write.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-250 - Execution with unnecessary privileges
Assigner
References
1 reference
Date Public
2026-04-29 18:05
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CVE-2026-23560 (GCVE-0-2026-23560)
Vulnerability from cvelistv5 – Published: 2026-07-09 15:12 – Updated: 2026-07-09 16:08
VLAI
EPSS
VEX
Title
Multiple RBAC issues in XAPI
Summary
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]
XAPI can configure different users with different roles, using Role
Based Access Control. For more details, see:
https://docs.xenserver.com/en-us/xencenter/current-release/rbac-overview.html#rbac-roles
The pool-admin role is fully privileged. Notably, users with this role
can also SSH into the host as root.
The other administrator roles are pool-operator, vm-power-admin and
vm-admin, each of which are authorised to configure and manage various
aspects of the system.
Some settings are inadequately restricted, and can be set by a lower
privilege of administrator than expected.
* CVE-2026-23559: A vm-admin can set VBD.other_config:backend-local and
turn arbitrary files in dom0 into VDIs (virtual disks) and give said
disks to a VM they control. This is an arbitrary read and/or modify
of files in dom0.
* CVE-2026-23560: A vm-admin can set VM.other-config:is_system_domain
and mark a VM as a system domain. System domains are ignored and
left running during certain other host/pool operations, and may be
hidden from view in tooling.
* CVE-2026-23561: A vm-admin can set VM.other_config:storage_driver_domain
and mark a VM as the storage domain for a particular host storage
connection (PBD). Shutting down the VM can cause the PBD to be
erroneously marked as unplugged when it is not.
* CVE-2026-23562: Configuration of PCI passthrough is normally
restricted to the pool-admin role. However one API was missing this
check, allowing a vm-admin access to unintended host hardware.
* CVE-2026-42486: A vm-admin can set the VM.platform:hvm_serial
parameter, which should be restricted to the pool-admin role, as it
can allow arbitrary dom0 file write.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-250 - Execution with unnecessary privileges
Assigner
References
1 reference
Date Public
2026-04-28 18:05
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CVE-2026-23561 (GCVE-0-2026-23561)
Vulnerability from cvelistv5 – Published: 2026-07-09 15:13 – Updated: 2026-07-10 03:55
VLAI
EPSS
VEX
Title
Multiple RBAC issues in XAPI
Summary
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]
XAPI can configure different users with different roles, using Role
Based Access Control. For more details, see:
https://docs.xenserver.com/en-us/xencenter/current-release/rbac-overview.html#rbac-roles
The pool-admin role is fully privileged. Notably, users with this role
can also SSH into the host as root.
The other administrator roles are pool-operator, vm-power-admin and
vm-admin, each of which are authorised to configure and manage various
aspects of the system.
Some settings are inadequately restricted, and can be set by a lower
privilege of administrator than expected.
* CVE-2026-23559: A vm-admin can set VBD.other_config:backend-local and
turn arbitrary files in dom0 into VDIs (virtual disks) and give said
disks to a VM they control. This is an arbitrary read and/or modify
of files in dom0.
* CVE-2026-23560: A vm-admin can set VM.other-config:is_system_domain
and mark a VM as a system domain. System domains are ignored and
left running during certain other host/pool operations, and may be
hidden from view in tooling.
* CVE-2026-23561: A vm-admin can set VM.other_config:storage_driver_domain
and mark a VM as the storage domain for a particular host storage
connection (PBD). Shutting down the VM can cause the PBD to be
erroneously marked as unplugged when it is not.
* CVE-2026-23562: Configuration of PCI passthrough is normally
restricted to the pool-admin role. However one API was missing this
check, allowing a vm-admin access to unintended host hardware.
* CVE-2026-42486: A vm-admin can set the VM.platform:hvm_serial
parameter, which should be restricted to the pool-admin role, as it
can allow arbitrary dom0 file write.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-250 - Execution with unnecessary privileges
Assigner
References
1 reference
Date Public
2026-04-28 18:05
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"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-250",
"description": "CWE-250 Execution with unnecessary privileges",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-09T15:13:50.370Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xen.org/xsa/advisory-489.html"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Multiple RBAC issues in XAPI",
"x_generator": {
"engine": "Vulnogram 1.0.2"
}
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-23561",
"datePublished": "2026-07-09T15:13:22.160Z",
"dateReserved": "2026-01-14T13:07:36.961Z",
"dateUpdated": "2026-07-10T03:55:44.455Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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