7.1

CVE-2026-93852: openstack blazar Missing Authorization

CVSS: 7.1v4.0HighAwaiting analysis
AliasesUBUNTU-CVE-2026-93852DEBIAN-CVE-2026-93852
Published 18-09-2026Last modified 18-09-2026
Open JSON

Vulnerability summary

CVE-2026-93852 is a high (CVSS 7.1) Missing Authorization vulnerability in openstack blazar. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.6% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v4.0 (CVE.org)
EPSS score
0.37%
0%100%
Low · +0.15 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 18-09-2026
    PublishedVulnerability first disclosed.
  2. 18-09-2026
    Last modifiedVulnerability information updated.

Description

In OpenStack Blazar before 17.0.1, the V2 lease listing operation (GET /v2/leases) returns leases for every project without enforcing project scoping or an administrator-only policy. Any authenticated user with access to the Blazar REST API can enumerate leases belonging to other tenants, exposing lease IDs, reservation IDs, resource IDs, and reservation metadata. The exposed lease IDs also enable the object-level authorization bypass tracked in the companion request, allowing an attacker to then modify or delete the enumerated leases.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

30%

Versus all other CVEs

30-day change

+0.15 pp

From 0.22% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • blazarAll versions (No fix recorded) | < 18.0.0~rc1-3
Openstack1 product
  • blazar≥ 1.0.0, < 15.1.1 | ≥ 16.0.0, < 16.0.1 | ≥ 17.0.0, < 17.0.1
Ubuntu1 product
  • blazarAll versions (No fix recorded)

3 vendors · 3 products

References

4 links