Xen Orchestra (with xo-web through 5.80.0 and xo-server through 5.84.0) mishandles…
Priority LOW 21CWE-863Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-863.
Summary
Xen Orchestra (with xo-web through 5.80.0 and xo-server through 5.84.0) mishandles authorization, as demonstrated by modified WebSocket resourceSet.getAll data is which the attacker changes the permission field from none to admin. The attacker gains access to data sets such as VMs, Backups, Audit, Users, and Groups.
Why it matters now
EPSS 0.00714 53rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | xo-web (npm) | up to 5.80.0 | — | No fix listed | GHSA-grvm-gcqf-gh8q |
| — | xo-server (npm) | up to 5.84.0 | — | No fix listed | GHSA-grvm-gcqf-gh8q |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- xo-web (npm) Vendor— Affected up to 5.80.0 Fixed in — No fix listed GHSA-grvm-gcqf-gh8q
- xo-server (npm) Vendor— Affected up to 5.84.0 Fixed in — No fix listed GHSA-grvm-gcqf-gh8q
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:xen-orchestra:xo-server:*:*:*:*:*:*:*:* | up to 5.84.0 | Vulnerable | Xen-orchestra |
| cpe:2.3:a:xen-orchestra:xo-web:*:*:*:*:*:*:*:* | up to 5.80.0 | Vulnerable | Xen-orchestra |
- cpe:2.3:a:xen-orchestra:xo-server:*:*:*:*:*:*:*:* Versions up to 5.84.0 Vulnerable ·Xen-orchestra
- cpe:2.3:a:xen-orchestra:xo-web:*:*:*:*:*:*:*:* Versions up to 5.80.0 Vulnerable ·Xen-orchestra
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-36383
- 2026-10-03 Alias added: GHSA-grvm-gcqf-gh8q
References
Sources
- CVE-2021-36383 · CVE Program
- CVE-2021-36383 · NVD
- FIRST EPSS
- GHSA-grvm-gcqf-gh8q · GitHub Advisory Database · CC BY 4.0
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