Vulnerability · Published Sep 18, 2026 · Assigned by mitre
CVE-2026-93854
High 7.2
In plain English
A high-severity security flaw in Blazar from OpenStack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | blazar | no fix listed | DEBIAN-CVE-2026-93854 |
| Debian:14 | blazar | 18.0.0~rc1-3 | DEBIAN-CVE-2026-93854 |
| Ubuntu:26.04:LTS | blazar | no fix listed | UBUNTU-CVE-2026-93854 |
| Ubuntu:26.10 | blazar | no fix listed | UBUNTU-CVE-2026-93854 |
Affected products (as reported)
Weakness: CWE-1025 · Vector: 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
References
- https://launchpad.net/bugs/2162719 issue-tracking