CVE-2021-36383 json
Xen Orchestra Mishandles Authorization
published 2021-07-12 5 y ago modified 2026-06-17 4 mo ago also GHSA-grvm-gcqf-gh8q , EUVD-2022-4005
- cvss
- 4.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
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.
Exploit prediction
0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/vatesfr/xen-orchestra/issues/5712 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | xo-web | <=5.80.0 |
no fix listed |
| npm | xo-server | <=5.84.0 |
no fix listed |
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/vatesfr/xen-orchestra/issues/5712
web, exploit, issue-tracking, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-36383
advisory
-
github.com
/vatesfr/xen-orchestra
package
Sources
- CVE List CVE-2021-36383
- GitHub Advisory GHSA-grvm-gcqf-gh8q
- NVD CVE-2021-36383
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