{"id":"CVE-2026-93854","title":"In OpenStack Blazar before 17.0.1, the V2 lease API does not enforce object-level authorization on its update and delete operations (PUT /v2/leases/{lease_id} and DELETE /v2/leases/{lease_id})","summary":"In OpenStack Blazar before 17.0.1, the V2 lease API does not enforce object-level authorization on its update and delete operations (PUT /v2/leases/{lease_id} and DELETE /v2/leases/{lease_id}). The policy authorize() wrapper attempts to …","severity":"high","cvss":7.2,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","cwe":["CWE-1025"],"vendor":"OpenStack","product":"Blazar","affected":["Blazar >= 1.0.0 < 15.1.1","Blazar >= 16.0.0 < 16.0.1","Blazar >= 17.0.0 < 17.0.1"],"published":"2026-09-18","updated":"2026-09-22","sourceUpdated":"2026-09-22T19:56:19.073","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93854","references":[{"url":"https://launchpad.net/bugs/2162719","label":"cve@mitre.org"}],"tags":["nvd","cve.org"],"epss":0.0024,"epssPercentile":0.15326,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-22T15:19:18.318576Z"},"cvssSource":"cna","ingestedAt":"2026-09-18T19:49:30.582Z","slug":"CVE-2026-93854","body":"## Overview\n\nIn OpenStack Blazar before 17.0.1, the V2 lease API does not enforce object-level authorization on its update and delete operations (PUT /v2/leases/{lease_id} and DELETE /v2/leases/{lease_id}). The policy authorize() wrapper attempts to load the target lease to build the authorization target from its owner, but it looks up the lease under the keyword \"lease_id\" whereas the controller methods name the parameter \"id\" (and the wsme_pecan.wsexpose wrapper delivers it positionally). The lookup returns None, and thus authorization falls back to the requesting user's own project_id/user_id instead of the target lease owner. Any authenticated user who knows a lease ID can therefore modify or delete leases belonging to other users and projects, bypassing the intended ownership check.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":39.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}