{"cve":"CVE-2021-36383","nvd":{"published":"2021-07-12T14:15:11.770","modified":"2026-06-17T03:58:47.003","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3},"cwes":[],"references":["https://github.com/vatesfr/xen-orchestra/issues/5712","https://github.com/vatesfr/xen-orchestra/issues/5712"],"products":["xen-orchestra:xo-server","xen-orchestra:xo-web"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-36383","score":0.00714,"percentile":0.5374,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-grvm-gcqf-gh8q","url":"https://osv.dev/vulnerability/GHSA-grvm-gcqf-gh8q","summary":"Xen Orchestra Mishandles Authorization","modified":"2023-11-08T04:06:13.465015Z","packages":[{"ecosystem":"npm","name":"xo-web","purl":"pkg:npm/xo-web","ranges":["<=5.80.0"],"fixed":[]},{"ecosystem":"npm","name":"xo-server","purl":"pkg:npm/xo-server","ranges":["<=5.84.0"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}